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in duty,on duty,off duty,duty free区别

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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
in duty,on duty,off duty,duty free区别
B
in duty有义务,有责任
as in duty bound
有责任,义不容辞
be in duty bound
有义务(做某事)
be in duty bound to do sth.
有义务(做某事)
on duty值班,当值
off duty下班
Only one doctor is on duty today - the other doctor is off duty.
今天只有一个医生值班,另一位下班了.
duty free免税
in duty,on duty,off duty,duty free区别 duty on duty go on duty come off duty,How wonderful every day! tax free 与duty free的区别 DUTY FREE SHOP怎么样 翻译duty---free i'm off duty . on duty中的duty是动词吗 on duty音标急快啊 is on duty today tax & duty free怎么翻译