______the employees’ working efficiency, the supervisor will allow them to have

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问题 ______the employees’ working efficiency, the supervisor will allow them to have a coffee break.

选项 A、Improving
B、To improve
C、Having improved
D、Improved

答案 B

解析本题考查不定式。to do可以表示“为了…”，类似词组还有in order to do或so as to do。

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