【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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