题目内容

I am looking after little Tom today. He’s been in my house _________ 8:00 this morning.
A．atB．sinceC．forD．till
B

试题分析：句意：今天我一直在照顾小汤姆，从今天上午八点他就一直在我家。现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作（用行为动词表示）或状态（be动词表示）常与for（+时间段）,since（+时间点或过去时的句子）连用。根据该句的时间是时间点，故选B。
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