【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(rèn)為他不可能解決這樣一個(gè)難題。A.這個(gè);B.那個(gè);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(yīng)填it,故選C

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