题目内容
14．I'm looking after Tom today．He's been in my house______8：00 this morning．（ ）| A． | at | B． | since | C． | for | D． | till |
分析 今天我在照顾汤姆，自从上午八点他就在我家．
解答 答案：B．
根据8：00 this morning 可知这是时间点．根据句子中的He's been in my house 可知这是现在完成时态．"Since+时间点"用于现在完成时表示动作从某一时刻起持续到现在，故选B
点评 本题考查时间介词的用法．熟记时间介词的用法，掌握每一个时间介词后跟的时间类型及每个时态常用时间状语，是做题的关键．
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