Since I began to work here three years ago,this factory---in

问题描述:

Since I began to work here three years ago,this factory___in size. A.had doubled B.has doubled
为什么B解释下谢谢
1个回答 分类:英语 2014-10-03

问题解答:

我来补答
B since 加过去时,主句要用现在完成时,如:
It has been 5 years since I came here.
 
 
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