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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