they have married since twenty years ago since之前能不能加上持续性动词呢?

they have married since twenty years ago since之前能不能加上持续性动词呢?

题目
they have married since twenty years ago since之前能不能加上持续性动词呢?
顺便说说清楚
答案
since 前面的主句必须用持续性动词.married 不延续,所以这句话应该为 They have been married since twenty years ago.
have been married 表示状态
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