(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
网友回答
A. when；it
B. as;what
(答案→)C. as;which
D. that;and
解析：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。