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有时风大流急，船舶靠码头时必须掉头顶流。（）
A:A ship has to turn to stem the tide because the wind is strong when she is getting alongside a wharf.
B:Sometimes the wind is strong and the current is rough, so a ship has to turn to stem the tide when she is getting alongside a wharf.
C:The wind is big, a ship must get alongside a wharf so she has to turn to stem the tide.
D:A ship has to turn to stem the tide so she can get alongside a wharf.

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出自：船舶水手证

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