--Have your students ever seen the silent film? --No, they are too young ______ the ol

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--Have your students ever seen the silent film?

--No, they are too young ______ the old film.

A. to seeing

B. have seen

C.to have seen

D. to have

参考答案:

C答案为C。“你的学生们看过无声电影吗?”“没有,他们太年轻了,没有看过老电影。”不定式的完成式表示不定式的动作发生在谓语动词之前。只有C形式正确。