—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

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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
—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 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


 
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.

因为Somebody算在Singular Verb 所以要用 has 而不是 had

强调已经完成对现在造成影响

因为前面有个Look!暗示你说话人形容情况的时间点在现在,
但是"擦"这个动作时在过去,所以后面是it wasn't me
不懂可以追问