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After a short rest, the soldiers keep on _________ till midnight.
A.workB.workingC.to workD.to working
B

试题分析:句意:简单休息一会后,战士们继续工作到半夜。keep on doing表示“一直做某事”,此为以固定用法,其他形式都是错误的。故选B。
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