When the boss entered the room, the workers were pretending ____ hard at their machines. A.to work B...
2022-07-16 12:56:45 168次 天津市2019-2020学年高二11月四校联考英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
When the boss entered the room, the workers were pretending ____ hard at their machines.
A.to work B.to be working C.to have worked D.working
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