.—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

解析試題分析:句意為:---這個(gè)院子今天很干凈,井井有條。---我沒有注意到。很明顯是有人打掃了。根據(jù)語境,這是一個(gè)過去發(fā)生的動(dòng)作對現(xiàn)在造成的影響或結(jié)果,應(yīng)用現(xiàn)在完成時(shí)。故選C。
考點(diǎn):考查現(xiàn)在完成時(shí)。

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