当然选B.因为A明显是错误的,for和ago是不能一起用的.
since+时间段＋ago还是表达的时间段.字面意思是“从两小时前”,还是说两小时的意思,是时间段.
初中英语一问howlong hane you been at the airpot?I hane been here _
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