Look!somebody____the sofa.-Well,it wasn't me.I didn't do it.A.is cleaningLook!somebody____the sofa.Well,it wasn't me.I didn't do it.A.is cleaning B.was cleaning C.has cleaned D.had cleaned

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Look!somebody____the sofa.-Well,it wasn't me.I didn't do it.A.is cleaningLook!somebody____the sofa.Well,it wasn't me.I didn't do it.A.is cleaning B.was cleaning C.has cleaned D.had cleaned
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Look!somebody____the sofa.-Well,it wasn't me.I didn't do it.A.is cleaningLook!somebody____the sofa.Well,it wasn't me.I didn't do it.A.is cleaning B.was cleaning C.has cleaned D.had cleaned
Look!somebody____the sofa.-Well,it wasn't me.I didn't do it.A.is cleaning
Look!somebody____the sofa.Well,it wasn't me.I didn't do it.
A.is cleaning B.was cleaning C.has cleaned D.had cleaned

Look!somebody____the sofa.-Well,it wasn't me.I didn't do it.A.is cleaningLook!somebody____the sofa.Well,it wasn't me.I didn't do it.A.is cleaning B.was cleaning C.has cleaned D.had cleaned
选C
这里强调的是过去发生的动作对现在的影响.所以要用完成时态.同时,这个过去发生的动作到说话时已经完成,而不是一直进行下去,所以用现在完成时.（如果一直进行下去,并有可能持续到将来,就用现在完成进行时）
意思是：看,沙发已经被清理干净了.呃,不是我做的.

C

根据答语 it wasn't me 可知 清洗沙发是过去做的事，并对现在造成了影响。
所以用现在完成时。

句意是：看！有人把沙发清洗干净了。哦，不是我，我没干。

Look!somebody____the sofa.-Well,it wasn't me.I didn't do it.A.is cleaningLook!somebody____the sofa.Well,it wasn't me.I didn't do it.A.is cleaning B.was cleaning C.has cleaned D.had cleaned look look! look look look look. look look look look look look look look look look look