21. ________ in a heavy traffic jam in a taxi while you are hurrying to the airport is quite an unpleasant experience.

A. Having caught                    B. Being caught

C. Caught                              D. Having been caught

22. The young man we followed stopped and looked as if ________ whether he was going in the right direction.

A. seeing                               B. to have seen

C. having seen                       D. to see

23. Thank you for the great trouble you’ve had ________ me with my computer work.

A. helping                             B. to help

C. with helping                      D. for helping

24. The houses ________ by the first company will be completed by the end of this year.

A. being built                        B. built

C. to be building                    D. to build

25. ________ by what everyone says about him, he has a good chance of winning.

A. Judged                            B. To Judge

C. Having Judged                 D. Judging

【答案解析】

1. A Charles Pettigrew“被生下来和被抚养”。

2. C The man与call是主动关系，用现在分词作定语“自称Mr. Grant的那个人”。

3. C动名词的复合结构作主语。(from www.nmet168.com)

4. D由句意判断用表示“位于”的不及物动词lie，用现在分词作主补。

5. B date from是不及物的，用现在分词，each dating from…相当于and each (tree) dates from…

6. C因The professor与make是主动关系，用现在分词；使自己被别人了解，know用过去分词。make oneself known to sb. =introduce oneself to sb.

7. B这是“祈使句+and+陈述句”句型。

8. D her long hair与flowing是主动关系，这是“独立主格结构”作状语。

9. D the tourists与show是被动关系，show发生在谓语之前，用完成式。                

10. C sullution / way to的to是介词，后接动名词。

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