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
答案：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
答案：C