问题

(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 medicinedirected,has drawn doctors’attention
A:when;it
B:as;what
C:as;which
D:that;and
B:as;what
C:as;which
D:that;and
正确答案是: