引起输卵管梗阻性不孕的最常见原因为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25957' and id < 2176989 and id<>'2176989' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25957' and id > 2176989 and id<>'2176989' order by id asc limit 5