【題目】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：我認為他不可能解決這樣一個難題。A.這個；B.那個；C.它；D.什么。根據(jù)句意可知，此句是賓語從句，此空是此句的主語，根據(jù)固定句型It is +adj.+(for sb.)+to do sth.可知，此空應填it,故選C。

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