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

来源:学生作业学帮网 编辑:学帮网 时间:2024/05/06 00:36:06

( )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.