單項(xiàng)選擇題The ship should be operated by a company which is issued a(an)()relevant to ship.

A.ISM
B.DOC
C.SMC
D.PSC


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1.單項(xiàng)選擇題Christopher Columbus () eighteen years () planning for that wonderful voyage which he made across the Atlantic Ocean.

A.spends;in
B.spent;on
C.has spent;on
D.had spent;in

2.單項(xiàng)選擇題Water can’t be used to put out fires of ()

A.Class A
B.Class B
C.Class C
D.B+C