They had kept working for several weeks everything was in order.A. beforeB. afterC. sinceD

发布时间：2020-08-17 00:47:57

They had kept working for several weeks      everything was in order.
A. before
B. after
C. since
D. unless

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(答案→)A. before
B. after
C. since
D. unless
解析：句意：他们持续不断工作了几个星斯后，一切才恢复正常。before “在……之前，过了多久后才……”；after “在……后”； since “自从”； unless “除非”。根据句意故选A
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