单选题Sailors must keep lookout in poor visibility.（）A水手必须在能见度很好时，进行了望。B驾驶员必须在能见度不良时，进行了望。C水手必须在能见度不良时，进行了望。D驾驶员必须在能见度很好时，进行了望。
单选题
Sailors must keep lookout in poor visibility.（）
A
水手必须在能见度很好时，进行了望。
B
驾驶员必须在能见度不良时，进行了望。
C
水手必须在能见度不良时，进行了望。
D
驾驶员必须在能见度很好时，进行了望。
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