單項選擇題The officer in charge of the engineering （）the watch to the reliving officer if there is reason to believe that the latter is obviously not capable of carrying out the watch-keeping duties effectively.

A.shall take over
B.shall not take over
C.shall hand over
D.shall not hand over


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3.單項選擇題We’d better （）economic speed （）fuel consumption.

A.take；save
B.to take；save
C.take；to save
D.to take；to save

4.單項選擇題This machine （）out of order very often, but now it works well.

A.is used to be
B.was used to be
C.used to be
D.was used to

5.單項選擇題When we arrived here yesterday, their ship （）for three days.

A.has left
B.had left
C.has been away
D.had been away