It is impossible___________ so much work in an hour.
A. finish            B. to finish      C. finishing   
B
本題的it形式主語(yǔ)，真正的主語(yǔ)應(yīng)位于句尾，用動(dòng)詞不定式to do來(lái)表示，故本
題的答案只能選B,to finish。
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