题目内容
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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