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【題目】He is busy his homework.

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

【答案】C

【解析】句意:他忙著做他的家庭作業(yè)。do做,動詞原形;does第三人稱單數形式;doing是動名詞形式;to do動詞不定式。這里使用的句型是be busy doing sth.忙于做某事,這里應用動名詞,故選C。

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