our country -the WTO for many years.A has joined C:has been

问题描述:

our country _the WTO for many years.A has joined C:has been in
1个回答 分类:英语 2014-11-26

问题解答:

我来补答
选B,因为后面的for many yeas 是持续的时间,所以必须用延续性动词,而A是非延续的.
 
 
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