The witness claimed______a man outside the house, but he was not sure whether this was the man.

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问题 The witness claimed______a man outside the house, but he was not sure whether this was the man.

选项 A、to see
B、to have seen
C、that he was
D、that he has seen

答案B

解析 句意:目击者声称看见屋外有一个男子,但他不肯定是否就是这位男子。本题考查动词不定式的完成时态。D项时态不对,不能用has seen,属过去的时间范畴,应当用to have seen。
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