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
搜题请搜索小程序“爱下问搜题”
（）the morning from 0800 to 1200 chief officer is on duty.
A.On
B.In
C.At
D.During
参考答案：B
