【題目】She is busy_______ her homework.

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

【答案】B

【解析】

試題分析:句意她忙著做她的家庭作業(yè)。do 做,動(dòng)詞原形;doing 現(xiàn)在分成形式;does第三人稱單數(shù)形式;did是過(guò)去式。這里be busy doing sth.是固定的句型,忙于做某事,故應(yīng)選B。

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