问题
单项选择题
Smoking in bed on a ship is prohibited（）.
A.at all times
B.during evening hours
C.unless another person is present
D.during drilling operations
答案
参考答案：A
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Smoking in bed on a ship is prohibited（）.
A.at all times
B.during evening hours
C.unless another person is present
D.during drilling operations
参考答案：A