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單項選擇題

There is a vessel ahead（）your movement.

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

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

A.on
B.in
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There is a vessel in position 120.0E 24.5N on course 120 degrees and speed 12.5 knots（）is not complying with traffic regulations.

A.this
B.who
C.which
D.it