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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。根據主句中的felt可知，其后的賓語從句應用過去時態，故可排除B和D；再根據語境和句中的for years可知用過去完成時比用一般過去時更佳。

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。因為“把夾克上衣落在操場上”這一動作發生在“發現”這一過去動作之前，所以要用過去完成時。

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：瑪麗午餐時間去售票處，但所有的票都已售罄。很顯然，票在瑪麗到達前已售完，屬于過去的過去，故用過去完成時。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。根據句意，約翰的爸爸和爺爺用這個皮箱是發生在約翰得到這個皮箱之前，所以空格處應填過去完成時。句意為：約翰的爸爸和爺爺以前上學用的皮箱現在被拿給約翰用了。

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

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

分析：D。因動詞see所表示的動先于stare和wonder之前，所以它要用過去完成時。答案D。句意為：她盯著那幅畫，琢磨著在哪看過這幅畫。

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。由于問句中用的時態是一般過去時(were)，說明對話雙方是在談論一部過去看過的電影；而根據so I already knew the story（所以我已經知道故事情節了）可知，說話者“看這本書”應該是在“看電影”之前，故用過去完成時。

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。比較主句中的動詞take與從句中的動詞do，很顯然do在先，take在后，而take在句中用的是一般過去時，故do要用過去完成時。

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。根據句意可知，“有人給玫瑰剪枝”發生在“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…這樣的過去時態，故“有人給玫瑰剪枝”發生在這一過去時間之前，也就是“過去的過去”，故用過去完成時。

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”用的是一般過去時went，所以“很忙”應用過去完成時had been。

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