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—Look!Somebody ______the blackboard. —Well,it wasn't me.I di

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—Look!Somebody ______the blackboard. —Well,it wasn't me.I didn't do it.
A.is cleaning B.was cleaning
C.had cleaned D.has cleaned
为什么选D,后面有wasn't(过去式),就应该是过去已经干完的啊,为什么不是过去完成时C?
—Look!Somebody ______the blackboard. —Well,it wasn't me.I di


 
和上句很相似,只不过是将blackboard换成了sofa.
 
可以参照以上解释来确定时态问题.