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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

___ the employees' working efficiency, the supervisor will allow them to have a coffee break.

A. Improving B. To improve C. Having improved D. Improved

 ______ 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.

A. Improving             B. To improve           C. Having improved     D. Improved