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21. We first met on a train in 2000. We both felt immediately that we ______ each other for years.

A. knew                   B. have known          C. had known           D. know

分析：C。根據(jù)主句中的felt可知，其后的賓語(yǔ)從句應(yīng)用過(guò)去時(shí)態(tài)，故可排除B和D；再根據(jù)語(yǔ)境和句中的for years可知用過(guò)去完成時(shí)比用一般過(guò)去時(shí)更佳。

22. The moment I got home, I found I ______ my jacket on the playground.

A. had left                B. left                       C. have left               D. was leaving

分析：A。因?yàn)椤鞍褗A克上衣落在操場(chǎng)上”這一動(dòng)作發(fā)生在“發(fā)現(xiàn)”這一過(guò)去動(dòng)作之前，所以要用過(guò)去完成時(shí)。

23. Mary went to the box office at lunchtime, but all the tickets ______ out.

A. would sell             B. had sold                C. have sold              D. was selling

分析：B。句意為：瑪麗午餐時(shí)間去售票處，但所有的票都已售罄。很顯然，票在瑪麗到達(dá)前已售完，屬于過(guò)去的過(guò)去，故用過(guò)去完成時(shí)。又如：I finally had to sell the car, but it had served its turn. 我最后只好把汽車賣了，不過(guò)也算是物盡其用了。

24. John was given the same suitcase his father and grandfather ______ with them to school.

A. took                     B. had taken              C. were taking           D. would take    

分析：B。根據(jù)句意，約翰的爸爸和爺爺用這個(gè)皮箱是發(fā)生在約翰得到這個(gè)皮箱之前，所以空格處應(yīng)填過(guò)去完成時(shí)。句意為：約翰的爸爸和爺爺以前上學(xué)用的皮箱現(xiàn)在被拿給約翰用了。

25. She stared at the painting, wondering where she ______ it.

A. saw                      B. has seen                C. sees                      D. had seen

分析：D。因動(dòng)詞see所表示的動(dòng)先于stare和wonder之前，所以它要用過(guò)去完成時(shí)。答案D。句意為：她盯著那幅畫(huà)，琢磨著在哪看過(guò)這幅畫(huà)。

26. —Were you surprised by the ending of the film?

—No, I ______ the book, so I already knew the story.

A. was reading          B. had read               C. am reading           D. have read

分析：B。由于問(wèn)句中用的時(shí)態(tài)是一般過(guò)去時(shí)(were)，說(shuō)明對(duì)話雙方是在談?wù)撘徊窟^(guò)去看過(guò)的電影；而根據(jù)so I already knew the story（所以我已經(jīng)知道故事情節(jié)了）可知，說(shuō)話者“看這本書(shū)”應(yīng)該是在“看電影”之前，故用過(guò)去完成時(shí)。

27. It took me a long time before I was able to fully appreciate what they ______ for me.

A. had done              B. did                       C. would do              D. were doing

分析：A。比較主句中的動(dòng)詞take與從句中的動(dòng)詞do，很顯然do在先，take在后，而take在句中用的是一般過(guò)去時(shí)，故do要用過(guò)去完成時(shí)。

28. I was just going to cut my rose bushes but someone ______ it. Was it you?

A. has done               B. had done               C. would do              D. will do

分析：B。根據(jù)句意可知，“有人給玫瑰剪枝”發(fā)生在“我去給玫瑰剪枝”之前，而“我去給玫瑰剪枝”用的是I was just going to cut my rose…這樣的過(guò)去時(shí)態(tài)，故“有人給玫瑰剪枝”發(fā)生在這一過(guò)去時(shí)間之前，也就是“過(guò)去的過(guò)去”，故用過(guò)去完成時(shí)。

29. —Peter, where did you guys go for the summer vacation?

—We ______ busy with our work for months, so we went to the beach to relax ourselves.

A. were                    B. have been             C. had been               D. will be

分析：C。根據(jù)句意可知，“很忙”在“去海邊放松”之前，而“去海邊放松”用的是一般過(guò)去時(shí)went，所以“很忙”應(yīng)用過(guò)去完成時(shí)had been。

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