◎ 题干
-Ten minutes ago, there __________ an eraser, a pen and some books on the desk.But now there __________ anything on it.
-Don't worry. Maybe someone put them away.
A. was, isn't   
B. were, isn't  
C. is, wasn't
D was, wasn't
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◎ 解析
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◎ 知识点
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