问题
选择题
_____ the employees' working efficiency, the supervisor will allow them to have a coffee break. [ ]
A. Improving
B. To improve
C. Having improved
D. Improved
答案
答案：B
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_____ the employees' working efficiency, the supervisor will allow them to have a coffee break. [ ]
A. Improving
B. To improve
C. Having improved
D. Improved
答案：B