Are you familiar with the rules of baseball?______ the rules of baseball familiar _ you
问题描述：
Are you familiar with the rules of baseball?______ the rules of baseball familiar _ you
答
Are you familiar with the rules of baseball?
（Are） the rules of baseball familiar （to） you?（同义句）
你对棒球的规则熟悉吗?
be familiar to sb,某人对某事熟悉.是事物作主语.原句是人作为主语.