Mary was not in her bedroom yesterday afternoon.She ______ i

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Mary was not in her bedroom yesterday afternoon.She ______ in her classroom.
A:should have been B:must have been C:must be D:should be 选哪个为什么

B
表示肯定的猜测
再问：为什么有have呢，句子不是说yesterday afternoon 了吗，为什么不选 c 呢
再答：这句用must have done,表示肯定过去的事
如果选must be，就要接目前的时间，而不是昨天下午

Mary was not in her bedroom yesterday afternoon.She ______ i Mary was not in her bedroom yesterday afternoon.She___in her mary -----(decorate)her bedroom this afternoon,isn't she Mary was w（）for her aunt yesterday afternoon.括 Yesterday she cleaned her bedroom well Mary is busy ( )in　her　　bedroom i met her in the street yesterday and she greeted me ______( mary was very ( )to see me in the street yesterday afternoon It was while she was sleeping in her bedroom ____ a thief br Sarah was in her bedroom and she was getting __ to go to wor She was e( ) in the playground whenI looked her yesterday. When she got home yesterday afternoon,her mother was＿＿(anger