He has worked very hard__he left school.A.for B.befor C.sinc

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He has worked very hard__he left school.A.for B.befor C.since

同学,很高兴回答你的问题
正确答案：选C.since
即：He has worked very hard since he left school.
翻译：自从他毕业以来,他一直工作非常努力.
解析：因为句子的时态是现在完成时,所以用since,因为since 是自从的意思,后面接某一个过去的时间点,也就是说从过去某个时态一直到现在,并且有可能还要继续下去,用现在完成时.for 后面接一段时间,所以不对；before 是在...之前,he left school 已经是一般过去时了,那么before he left school 就是“过去的过去”,那么主句就应该用过去完成时了,所以before 也是错误的.
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