our country _the WTO for many years.A has joined C:has been in

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our country _the WTO for many years.A has joined C:has been in

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.

C成为一员

应该是选A
重点是强调加入WTO,加入用 join这个词。

C:has been in
因为已经有很久的时间了,所以不能用点动词 join, 要用可以表示延续到动词be。

C join为非延续性动词,不能与for many years连用,而be为延续性动词,能够用于完成时态。

C.has been in