1.(2010全國II) Excuse me. I _______ I was blocking your way.
A. didn’t realize B. don’t realize?C. haven’t realized D. wasn’t realizing
答案：A
解析：“抱歉，我不知道擋了你的路?！北绢}考查時態(tài)，“沒有意識到”這一動作應該發(fā)生在過去，故選A。

2.(2010安徽) Bob would have helped us yesterday, but he _______.
A. was busy B. is busy C. had been busy D. will be busy
答案：A
解析：“鮑勃昨天本來可以幫助我們的，但是他當時很忙”。根據(jù)設空出前面would have helped us yesterday可知設空處表示的是昨天的事情，故用過去時，排除BD兩項；C項過去完成時表示“過去的過去”，而本句并沒有過去的動作做參照物，故排除C項。只有A項符合要求。

3.(2009重慶) — I’ve got to go now.
— Must you? I __________ you could stay for dinner with us.
A. think B. thought C. have thought D. am thinking
答案：B
解析：句意“我現(xiàn)在得走了?！薄澳惴堑靡邌?我原以為你能留下和我們一起吃飯的”。句中主語“I”的動作“認為”發(fā)生在過去，所以只有B項正確。

4.(2009全國I) Edward, you play so well. But I __________ you played the piano.
A. didn’t know B. hadn’t known C. don’t know D. haven’t known
答案：A
解析：本題考查一般過去時。句意“愛德華，你彈得這么好。但是我不知道你會彈鋼琴”。根據(jù)句意，指我過去不知道你會彈鋼琴，故用一般過去時。

5.(2009北京) Scientists have many theories about how the universe __________ into being.
A. came B. was coming C. had come D. would come
答案：A
解析：句意“關(guān)于宇宙是怎樣產(chǎn)生的，科學家們有很多種理論”。根據(jù)句意可知宇宙產(chǎn)生絕非將來要發(fā)生的事，所以先排除B、D兩項，C項had come為過去的過去，題中無過去時間作參照，故排除C。宇宙產(chǎn)生發(fā)生在過去，故用一般過去時。

6.(2009北京) When I talked with my grandma on the phone, she sounded weak, but by the time we __________ up, her voice had been full of life.
A. were hanging B. had hung C. hung D. would hang
答案：C
解析：句意“當我與奶奶在電話中交談時，她的聲音聽起來很虛弱，但到我們掛斷電話時，她的聲音已經(jīng)充滿了活力”。根據(jù)題干提示，her voice had been full of life為過去的過去，因此我們掛斷電話發(fā)生在過去，故選C。

7.(2009山東) I was out of town at the time, so I don’t know exactly how it _______.
A. was happening B. happened C. happens D. has happened
答案：B
解析：“那是我不在城里，所以我不確切地知道事情是怎么發(fā)生的”。根據(jù)題干中was out of town及前后邏輯關(guān)系可知設空處說的是過去的事情，故用過去時，排除CD兩項；A項表示“未完性”，不符合本題要求，故被排除。

8.(2009湖南) When he _______ the door, he found his keys were nowhere.
A. would open B. opened C. had opened D. was to open
答案：D
解析：“當他要開門的時候，他發(fā)現(xiàn)鑰匙不見了”。was to do表示wanted to do或intended to do。would do在這里有情感意為，所以被排除。

9.(2008北京) -- Have you read a book called Waiting for Anya?
-- Who _______ it?
A. writes B. has written C. wrote D. had written
答案：C
解析：“你讀過一本叫做《等待安雅》的書嗎？”“誰寫的？”根據(jù)句意可知，發(fā)問方是對過去的事情進行提問，故排除AB兩項，因這兩項都是現(xiàn)在時；而D項表示過去的過去，也不符合本題的要求，故也被排除。

10.(2008天津) He _______ football regularly for many years when he was young.
A. was playing B. played C. has played D. had played
答案：B?
解析：“他年輕的時候踢了許多年足球”。本題考查時態(tài)。句中的when he was young是表示過去的時間狀語。題干中沒有強調(diào)在過去的某個時間段正在發(fā)生某事，故排除A項；句中也沒有信息詞強調(diào)對現(xiàn)在造成的影響或與現(xiàn)在的聯(lián)系，故排除C項；句中也沒有以過去的某個時間點或動作作參照，故排除D項。

11.(2007山東) They _______ two free tickets to Canada, otherwise they’d never have been able to afford to go.
A. had got B. got C. have got D. get
答案：B
解析：“他們得到了兩張去加拿大的免費機票，不然他們永遠都不會有錢去那兒?！眔therwise是虛擬語氣的暗示，從“they’d never have been able to…”可知，該句是已發(fā)生的事情的虛擬假設，而前半句是對過去事實的陳述，故選B。

12.(2007遼寧) -- Has your father returned from Africa yet?
-- Yes, but he _______ here for only three days before his company sent him to Australia.
A. was B. has been C. will be D. would be
答案：A
解析：“你父親從非洲回來了嗎？”“回來了，但是他在這兒只待了三天就被公司派到澳大利亞去了”。根據(jù)“before his company sent him…”，排除BCD，故選A。

13.(2007上海) — Did you tidy your room?
— No, I was going to tidy my room but I __________ visitors.?
A. had B. have C. have had D. will have
答案：A
解析：本題考查一般過去時。句意“……我正準備打掃房間，但是有客人來了”。答句應與問句的時態(tài)一致，這些事情都發(fā)生在過去，故選A。