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求解一道英语填空题.1. They ___________ friends since they met in Shan

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求解一道英语填空题.
1. They ___________ friends since they met in Shanghai.
A. have made B. have become C. have been D. have returned
选B对吗?为什么?
不对.选C
since...(自从...时候).since they met in Shanghai(自从他们在上海相遇),从“上海相遇”这个时间开始,一直延续到现在,主句应该用现在完成时,并且要用延续性动词(因为这个动作从“相遇”延续到现在).不能选A(交朋友),B(变成),D(恢复),它们都是瞬间动词.只有C,have been(been可以翻译成“做朋友”)是延续动词.