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

A．since B．for
C．a(chǎn)t 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(diǎn)就在我家了。Since+時(shí)間點(diǎn)，用于現(xiàn)在完成時(shí)當(dāng)中。故選A。
考點(diǎn)：考查現(xiàn)在完成時(shí)的用法。

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