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China (has joined ) the WTO and became a new member of it la

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China (has joined ) the WTO and became a new member of it last year.
为什么这里用joined,join不是非延续性动词吗?就算用现在完成时,也该是has been in
对不起 题目是China (has joined ) the WTO and became a new member of it
没有加since啊 可以这么用啊 在某个时间点 加入了WTO 成为了新的会员.楼主说的是has been 多少年后面应该有since
因为since主句只能用延续系动词
希望能够帮到楼主