求英语题答案详解!关于谓语的单复数!Half an hour ____ ______ (pass) since the train __________ (leave).答案 是has passed left 还是 have passed left?

Question

求英语题答案详解!关于谓语的单复数!
Half an hour ____ ______ (pass) since the train __________ (leave).
答案 是has passed left 还是 have passed left?

Answer 1

Half an hour has passed since the train left.从火车离开已经过去了半个小时.
半个小时是一段时间、谓语动词用单数.后面since引导的状语从句谓语动词要用终止性的过去时、表示的时间是“从动作开始的那一时刻起”.火车开走发生在过去、用一般过去时left.