We found it impossible______all the questions within the time given.A、solveB、be

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问题 We found it impossible______all the questions within the time given.

选项 A、solve
B、being solving
C、to have solved
D、to solve

答案 D

解析不定式(短语)做宾语时，如果其后跟补足语，通常用it作形式宾语来替代不定式这个真正宾语，故选D。

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