问题
选择题
(安徽省马鞍山市2009届高三第一次教学质量检测) It was reported that as many as 50％of patients do not take medicine
directed
， has drawn doctors’attention．
A．when；it
B．as;what
C．as;which
D．that;and
答案
答案：C
考察状语从句和定语从句，as引导方式状语从句，补全应该为as they are directed。Which引导非限制性定语从句指代前面整个句子且做主语。