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

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

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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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