2. 外语
  3. Careful surveys have indicated that as many as 50 percent of patients do not take drugs______ directed.

Careful surveys have indicated that as many as 50 percent of patients do not take drugs______ directed.

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问题 Careful surveys have indicated that as many as 50 percent of patients do not take drugs______ directed.
选项 A、like
B、so
C、which
D、as
答案D
解析 连接词as的意思是“按照，以……的方式”。like意为“像……一样”，作连接词时用来表示两事物之间的比较。so 作连词时意为“因此，所以”，它引起的分句表示前句的结果，而so后面接分词时，它不是连词而是副词； which一般引导定语从句，而且which后面不直接跟分词，故A，B和C错误，而D正确。
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