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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

Ship is（）position.

A.in
B.on
C.of
D.at

單項(xiàng)選擇題

Ships are always（）on water and they are easy to rust.

A.float
B.floating
C.floats
D.floated