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——Why are the tax collectors so busy?

    ——Many people prefer to have their tax forms completed by a professional rather than ___.

A、do it themselves B、doing it themselves 

C、to do it themselves  D、done by themselves

—Why are the tax collectors so busy?

     —Many people prefer to have their tax forms completed by a professional rather than ___.

A. do it themselves     B. doing it themselves 

C. to do it themselves     D. done by themselves

——Why are the tax collectors so busy?

    ——Many people prefer to have their tax forms completed by a professional rather than ___.

A、do it themselves            B、doing it themselves  

C、to do it themselves   D、done by themselves

——Why are the tax collectors so busy?
——Many people prefer to have their tax forms completed by a professional rather than ___.

——Why are the tax collectors so busy?

——Many people prefer to have their tax forms completed by a professional rather than ___.

A．do it themselves                        B．doing it themselves

C．to do it themselves                      D．done by themselves