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【题目】She is busy_______ her homework.

A. do B. doing C. does D. Did

【答案】B

【解析】

试题分析:句意她忙着做她的家庭作业。do 做,动词原形;doing 现在分成形式;does第三人称单数形式;did是过去式。这里be busy doing sth.是固定的句型,忙于做某事,故应选B。

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