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---whowasondutylastfriday?---A.lamb.lwasc.Yes,lwasD.no,lwasn't填的是哪个,为什么?

题目详情
---who was on duty last friday?---A.l am b.l was c.Yes,l was D.no,l wasn't
填的是哪个,为什么?
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答案选B
至周五谁值日?是我