单项选择题
The sailor taking （）watch should do cleaning work on the bridge.
A. 0 to 4
B. 4 to 8
C. 8 to 12
D. 12 to 16
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单项选择题
A. 0 to 4
B. 4 to 8
C. 8 to 12
D. 12 to 16
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