( )Luck was ____ duty yesterday,but she forget to clean the classroom.A.in B.of C.at D.on

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( )Luck was ____ duty yesterday,but she forget to clean the classroom.A.in B.of C.at D.on
( )Luck was ____ duty yesterday,but she forget to clean the classroom.
A.in B.of C.at D.on

( )Luck was ____ duty yesterday,but she forget to clean the classroom.A.in B.of C.at D.on
D on one's duty 某人值日

D on duty值日

A. be in duty是值日的意思.