It was reported that as many as 50% of patients do not take medicine ______ directed, ______ has drawn doctor’s attention.
A．when; itB．a(chǎn)s; whatC．a(chǎn)s; whichD．that; and
C
考查定語從句。第一個(gè)用as，表“正如”之意；而根據(jù)句子，第二個(gè)空格不需要再加一個(gè)代詞的，因此用which引導(dǎo)非限定性定語從句，選C。
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