Mr. Green is said _____ an experiment to prove the new method of solving the pro
题型：不详难度：来源：
Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.| A．to do | B．to have done | C．to be doing | D．to have been doing |
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答案
| B |
解析
| 由when young可知此处应该用不定式的完成式，表示此动作发生在谓语动作之前。 |
举一反三
Seeing the soldiers well _____ for the flood-fight, the general nodded with satisfaction.| A．prepare | B．preparing | C．prepared | D．having prepared |
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___________ a fine day, Shenzhou VI will be launched on time according to its planned time.| A．Being | B．It being | C．To be | D．It is |
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—I would like to buy an expensive camera.
—Well, we have several models_____ .| A．to choose from | B．to choose | | C．to be chosen | D．for choice |
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—Yes. You have to wear another pair.| A．washing | B．have washed | | C．having washed | D．being washed |
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