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.—This yard is so clean today and everything looks fine.
—I didn't notice that.  It's clear someone ________it.

A.cleansB.cleaned
C.has cleanedD.cleaning

C

解析试题分析:句意为:---这个院子今天很干净,井井有条。---我没有注意到。很明显是有人打扫了。根据语境,这是一个过去发生的动作对现在造成的影响或结果,应用现在完成时。故选C。
考点:考查现在完成时。

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