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【题目】The old lady didn't know ________ when her house caught fire.

A.what to doB.how to doC.what to do itD.how to doing

【答案】A

【解析】

句意:老太太的房子着火时,她不知道该怎么办。

本题考查动词不定式。what to do怎么办,how to do如何做,缺少宾语,因此排除B项。what to do it宾语it应去掉,what充当宾语,因此排除C项。动词不定式符号to后,不能用动词原形,因此排除D项。故选A

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