The witness claimed ______ a man in the party, but he was not sure whether this was the man.

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问题 The witness claimed ______ a man in the party, but he was not sure whether this was the man.

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

答案B

解析 由于see这个动作发生在谓语动作claim(声称)之前,所以要用完成式。
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