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【题目】I think _____ is impossible for him to work out such a difficult problem.

A. thisB. thatC. itD. what

【答案】C

【解析】

句意:我认为他不可能解决这样一个难题。A.这个;B.那个;C.它;D.什么。根据句意可知,此句是宾语从句,此空是此句的主语,根据固定句型It is +adj.+(for sb.)+to do sth.可知,此空应填it,故选C

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