题目内容
【题目】They have so much work to do, so they keep on until midnight.
A. work B. to work C. working D. worked
【答案】C
【解析】
试题分析：句意：他们有这么多工作要做，所以他们一直工作到半夜。keep on doing sth坚持做某事，所以选C。
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题目内容
【题目】They have so much work to do, so they keep on until midnight.
A. work B. to work C. working D. worked
【答案】C
【解析】
试题分析：句意：他们有这么多工作要做，所以他们一直工作到半夜。keep on doing sth坚持做某事，所以选C。