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【题目】It’s necessary for us ________ carefully when we are doing the exam paper.

A.thinkB.thoughtC.thinkingD.to think

【答案】D

【解析】

句意:当我们做试卷时认真思考是必要的。

It is +形容词+for sb+to do sth做某事对于某人是……,it代替动词不定式作形式主语,故选D

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