.-This yard is so clean today and everything looks fine.-I didn't notice that. It's clear someone it.A．cleans B．cleanedC．has cleaned D．cleaning 题目和参考答案——青夏教育精英家教网—

题目内容

.—This yard is so clean today and everything looks fine.

—I didn't notice that. It's clear someone ________it.

A．cleans B．cleaned

C．has cleaned D．cleaning

【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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