He__________has been a Party menber for 15 years.(同义句转换） ___15 yers since he____the party.
问题描述：
He__________has been a Party menber for 15 years.(同义句转换） ___15 yers since he____the party.
答
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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答
For 15 years since he had been in th party.
答
It has been; joined