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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1.單項(xiàng)選擇題Ship is（）position.
A.in
B.on
C.of
D.at
2.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
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