题目

(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：C 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。

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