题目内容
I’m ___ duty today. I must clean the classroom _____ school.
A.after; on | B.in; before | C.on; after | D.for; in |
C
试题分析: 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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