He__________has been a Party menber for 15 years.(同义句转换） ___15 yers since he____the party.

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He__________has been a Party menber for 15 years.(同义句转换） ___15 yers since he____the party.

He__________has been a Party menber for 15 years.(同义句转换） ___15 yers since he____the party.
He__________has been a Party menber for 15 years.(同义句转换） ___15 yers since he____the party.

He__________has been a Party menber for 15 years.(同义句转换） ___15 yers since he____the party.
It has been; joined

For 15 years since he had been in th party.

更正楼上错误，正确答案如下：
= (It is) 15 years since he (joined) the Party.
如果前面是三空，才是：
= (It has been) 15 years since he (joined) the Party.
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He__________has been a Party menber for 15 years.(同义句转换） ___15 yers since he____the party. has been have been have been have been have been Been away been是什么意思 been是什么意思 been是什么意思? been是什么意思? had been always been 还是been always? have been / has been / had been 的区别 has been / have been /had been ………… 英语中have been；has been是什么? has been doing have been done区别 have been还是have been being?