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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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單項(xiàng)選擇題

She arrived at the anchorage last night and anchored（）berth.

A.waiting
B.awaiting
C.awaiting for
D.waited

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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