【題目】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:當(dāng)我們做試卷時(shí)認(rèn)真思考是必要的。

It is +形容詞+for sb+to do sth做某事對(duì)于某人是……,it代替動(dòng)詞不定式作形式主語,故選D。

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