题目内容
It is impossible for anyone _____ these photographs before, because Mr Newman had them developed today.
- A.having seen
- B.to have seen
- C.to see
- D.seeing
B
it是形式主语,不定式作真正的主语;由before可知要用不定式的完成式。
it是形式主语,不定式作真正的主语;由before可知要用不定式的完成式。
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