【題目】He was so busy ____ his homework that he forgot to have supper.

A. to do B. do C. doing

【答案】C

【解析】句意:他如此忙著做他的家庭作業(yè)以至于他忘記了吃晚飯。to do 是動(dòng)詞不定式形式;do動(dòng)詞原形;doing是動(dòng)名詞形式。這句話中使用的句型是be busy doing sth.忙于做某事,故應(yīng)選C。

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