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

分类: 作业答案 • 2021-12-19 16:20:35

问题描述：

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

答

A. be in duty是值日的意思.

答

D on duty值日

答

D on one's duty 某人值日