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單項選擇題

The main tasks for sailors on duty are, first of all,（）the persons who come on board to do their business.

A.received
B.receives
C.receiving
D.receive

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單項選擇題

Where are （）goods carried on board?

A.danger
B.dangerous
C.A+B
D.A or B

單項選擇題

（）social instruction on cargo securing.

A.Has
B.Had
C.Have
D.Having