--- How many concerts ____ up to now?

--- About 25. Last night we ____ our biggest one.

A．did you play, have had

B．have you played, had

C．had you played, have had

D．do you play, have had

交流耐压试验调压器的容量和试验变压器的容量相对比（）。

A.前者小于后者

B.前者远大于后

C.前者等于或稍大于后者

D.无规定