问题
单项选择题
（）the morning from 0800 to 1200 Chief Officer is on duty.
A.On
B.In
C.At
D.During
答案
参考答案：B
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（）the morning from 0800 to 1200 Chief Officer is on duty.
A.On
B.In
C.At
D.During
参考答案：B