问题标题:
【tisthreeyearssincehejoinedtheLeague?itisthreeyearssincehehasjoinedtheLeague?那个正确?为什么呢?】
问题描述:
tisthreeyearssincehejoinedtheLeague?itisthreeyearssincehehasjoinedtheLeague?
那个正确?为什么呢?
兰旭光回答:
ItisthreeyearssincehejoinedtheLeague.这个正确
Itis/hasbeen+sometime+sincesb.didsth.这是固定结构,"自从某人做某事以来有...时间了."since从句中谓动只能用过去式.
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