问题
单项选择题
The quartermasters（）steer the ship and help the officer keep lookout.
A.duty
B.on duty
C.at duty
D.in duty
答案
参考答案：B
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The quartermasters（）steer the ship and help the officer keep lookout.
A.duty
B.on duty
C.at duty
D.in duty
参考答案：B