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问题: 1、Mr Hason receive training at a local training ce

1、Mr Hason receive training at a local training centre ,________ he went to shanghai and was employed by a state-owned enterprise.
A afer which B since which
2、For 22 years , ________ I left home for college, my father telephoneed me every sunday at 9:00 a.m.
A since B after C when
第一个为什么不能用B,第二个为什么能用since

解答:

第一个句子,前半句是不是received?第一个句子用after which 是因为首先前后句没有完成时态出现,而且在语意上是说汉森先生去上海工作后开始锻炼。
第二个句子,前半句,for 22 years,是完成时态的提示,因为父亲每周六打电话给儿子,已经坚持了22年了。所以要用since.

这两个句子中虽然都没有完成时态形式上的出现,但是要理解句意,就会发现第二个句子是含有完成时态的