题目内容

【题目】I kept on _______ my homework until it was dark yesterday afternoon.
A.do
B.did
C.doing

【答案】C
【解析】句意：昨天下午，我不断地做作业一直到天黑。根据固定搭配：keep on doing sth.不停地做某事。所以答案是：C.

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