1. In June, 1981, six teenagers in the village of Medjugorje, Yugoslavia, claimed to have had visions of the Virgin Mary, who they say has continued to appear to them over the ensuing years.

(A) claimed to have had visions of the Virgin Mary, who

(B) claimed to have visions of the Virgin Mary, whom

(C) claimed to have had visions of the Virgin Mary, whom

(D) claimed to have visions of the Virgin Mary, who（A）

(E) had claimed to have had visions of the Virgin Mary, whom

不明白答案A中的have had visions 是什么结构？D看起来也很有道理啊！！