He () the Party since 1977 A.joined B.has joined C.has been in 单选及原因

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He () the Party since 1977 A.joined B.has joined C.has been in 单选及原因
He () the Party since 1977 A.joined B.has joined C.has been in 单选及原因

He () the Party since 1977 A.joined B.has joined C.has been in 单选及原因
这道题的正确答案是:
C
在完成时中,短暂性动词join变为be in 加入
自1977年他就加入了党.
如对我的回答对你有所帮助,请别忘记采纳

B. has joined
He has joined the Party since 1977. 他1977年就入党了。
谢谢。请采纳。O(∩_∩)O~

选C,since是现在完成时的标志,而且现在完成时里面的动词得是可持续性的动词,所以选C