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I am looking after Tom today.He’s been in my house ______________  8:00 this morning.

A.since B.for
C.at D.till

A

解析试题分析:句意:我今天一整天都在照顾Tom。他从早晨八点就在我家了。Since+时间点,用于现在完成时当中。故选A。
考点:考查现在完成时的用法。

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