________ the working efficiency, the boss allows the employees to have a coffee break. [ ]A. ImprovingB. To improve C. Having improvedD. Improved-高中英语-n多题

◎ 题干

________ the working efficiency, the boss allows the employees to have a coffee break.

[ ]

A. Improving
B. To improve
C. Having improved
D. Improved

◎ 答案

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◎ 解析

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◎ 知识点

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