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【题目】What are they _______? ( )

They are _______ the windows.

A.doing; cleanB.doing; cleaningC.do; clean

【答案】B

【解析】

句意:—他们正在干什么?—他们正在擦窗户。考查了现在进行时的用法,其结构为主语+be+动词现在分词,clean现在分词cleaning,故选B

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