單項(xiàng)選擇題

There（）salvage operations in position, south side of fairway at Fishhaven.

A.is
B.has
C.are
D.have

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單項(xiàng)選擇題

There is a vessel ahead（）your movement.

A.backup
B.blocking
C.choking
D.obstructing

單項(xiàng)選擇題

There is a vessel carrying（）hydrographic survey in the area marked by red lights.

A.on
B.in
C.out
D.with