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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

________the working efficiency, the boss allows the employees to have a coffee break.

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

________ the working efficiency, the boss allows the employees to have a coffee break.

A. Improving                                           B. To improve       

C. Having improved                                  D. Improved

______ the working efficiency, the boss allows the employees to have a coffee break.

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

______ the working efficiency, the boss allows the employees to have a coffee break.

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

____the working efficiency,the boss allows the employees to have a coffee break.?

   A.Improving           B.To improve?

   C.Having improved  D.Improved?

________the working efficiency, the boss allows the employees to have a coffee break.

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