— Is John coming by train?

— He should, but he _____ not. He likes driving his car. [ ]

A. must

B. can

C. may

D. need

未被激活电子制动阀的制动手柄，需用销子将其锁定在（）上，以免发生误动作。

A、制动位

B、紧急制动位

C、缓解位

D、重联位