【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 是動詞不定式形式;do動詞原形;doing是動名詞形式。這句話中使用的句型是be busy doing sth.忙于做某事,故應選C。

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