– 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

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

 —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.

1. A.
   while
2. B.
   until
3. C.
   when
4. D.
   Before