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问题: 单选22

The man we followed suddenly stopped and looked as if _______ whether he was going in the right direction.

A.seeing B.having seen
C.to have seen D.to see

解答:

翻译一下:我们跟着的那个人突然停下来四周张望似乎在看自己是否走的是一条正确的路线.
这里应用不定式做目的状语.
可排除AB.
C 不定式的完成式表明动作发生做句中动作之前."看"的动作没有发生在"停下来和四周张望"之前.可排除.
选D