问题
选择题
________ 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
答案：B
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________ 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：B