题目内容

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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