Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.A.to

题目简介

Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.A.to

题目详情

Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
A.to doB.to have doneC.to be doingD.to have been doing
题型:单选题难度:偏易来源:不详

答案

B
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。

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