----- Mary looks very upset. She _______ failed to pass the exam.

----- I guess so. It's very difficult after all.

A． must have

B．could have

C．should have

D．might have

根据《驾驶、轮机联系制度》的要求，开航前值班驾驶员应会同（）核对船钟、车钟、试舵等并分别将情况记入（）。

A.大管轮/航海日志、车钟记录簿

B.值班轮机员/航海日志、轮机日志、车钟记录簿

C.电机员/航海日志、轮机日志

D.轮机长/航海日志、轮机日志