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– I wonder how much you charge for your services.

-- The first two are free ____  the third costs $30.

A. while                                B. until

C. when                                D. before

– I wonder how much you charge for your services.

-- The first two are free ____  the third costs $30.

A. while           B. until             C. when           D. before

-– I wonder how much you charge for your services.

 --- The first two are free         the third costs $30.  

 A. while       B. until         C. when          D. before

29．---- I wonder how much you charge for your services.

---- The first two are free ____  the third costs $30.

       A．while          B．until　　  C．when          D．Before

—I wonder how much you charge for your services.

— The first two are free____ the third costs $30.

A. while                  B. until      C. when                  D. before