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單項(xiàng)選擇題

Shall we（）wait at the roadstead till there is a free berth for us?

A.must
B.ought to
C.have to
D.never

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單項(xiàng)選擇題

Routine radio communications should be no more than（）.

A.one minute
B.three minutes
C.five minutes
D.eight minutes

單項(xiàng)選擇題

PORT A BIT SLUGGISH means that port rudder（）.

A.answers very well
B.rudder answers all right
C.answers slow
D.answers fast

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