He _______ cards with his friends, but now he _______ a walk after supper.

A．used to play; is used to having

B．is used to playing, used to have

C．used to play; is used to have

D．is used to playing; is used to have

采煤机检修后牵引部试验准备是按要求（）。

A、接通电源

B、注入冷却水

C、性能调试

D、加载

E、注油排气