________ the working efficiency, the boss allows the employees to have a coffee break.[ ]A．ImprovingB．To improveC．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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