It was reported that as many as 50% of patients do not take medicine directed, has drawn doctor’s 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：考查定语从句。第一个用as，表“正如”之意；而根据句子，第二个空格不需要再加一个代词的，因此用which引导非限定性定语从句，选C。