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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

解析試題分析：句意：我今天一整天都在照顧Tom。他從早晨八點就在我家了。Since+時間點，用于現在完成時當中。故選A。
考點：考查現在完成時的用法。

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