问题: 1、Mr Hason receive training at a local training ce
1、Mr Hason received 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:
1a
2a
since是用于点时间的场合,after是用于段时间的场合.
第一题中,表示时间的是主句received training 动词组
第二题,提示时间段的开始的是I left home for college这个点时间动作.
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