He left home two weeks ago and we haven't heard from him__

问题描述:

He left home two weeks ago and we haven't heard from him__
A since B later C already Dstill
为什么选A?
好难理解,那其他的为什么不对呢?

他在两周前离开了,自那以后杳无音信since 后省略的是two weeks ago两个月之后没有他的消息,怎么不能用laterhaven't heard是现在完成时,若用later要改成过去完成时哦哦哦哦哦,,,明白了!!厉害