问题
选择题
I’m ___ duty today. I must clean the classroom _____ school.
A．after; on
B．in; before
C．on; after
D．for; in
答案
C
题目分析: 句意：我今天值班，我必须放学后把教室打扫干净。on duty值班，after school放学后，故答案选C.
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I’m ___ duty today. I must clean the classroom _____ school.
A．after; on
B．in; before
C．on; after
D．for; in
C
题目分析: 句意：我今天值班，我必须放学后把教室打扫干净。on duty值班，after school放学后，故答案选C.