— Did Peter fix the computer himself?

— He __________, because he doesn’t know much about computers.

A．has it fixed

B．had fixed it

C．had it fixed

D．fixed it

车辆购置税综合服务窗口职责包括（）。

A.实地验车

B.车辆购置税纳税申报

C.补（换）证明

D.退税处理