單項(xiàng)選擇題

Keep clear（）the buoy.

A.to
B.on
C.of
D.for

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單項(xiàng)選擇題

Large vessel leaving.Keep clear（）approach channel.

A.off
B.reach
C.from
D.of

單項(xiàng)選擇題

Let’s submit the case（）the cargo surveyor.

A.to
B.of
C.for
D.about