问题描述:
in duty,on duty,off duty,duty free区别
The students ________ should clean the classroom.
A.in duty
B.on duty
C.off duty
D.dutyl free
请问这四个选项的意思
The students ________ should clean the classroom.
A.in duty
B.on duty
C.off duty
D.dutyl free
请问这四个选项的意思
问题解答:
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