问题
选择题
______ the worker’s working efficiency, the manager will allow him 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 worker’s working efficiency, the manager will allow him to have a coffee break.
A．Improving
B．To improve
C．Having improved
D．Improved
答案：B