【題目】Tim is busy __________ his homework every day.

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

【答案】D

【解析】

句意：Tim每天都忙著做他的家庭作業(yè)。do做，動詞原形；does是第三人稱單數(shù)形式；did是do的過去式；doing是動名詞形式。這句話中使用了句型be busy doing sth.忙于做某事，故這里應(yīng)用動名詞形式，選D。

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