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 考查as引导方式状语从句。在as引导的方式状语从句中,尤其含有be时,常常会省略一部分,而保留其主要成分,如分词或形容词。句中“take drugs as directed”为“take drugs as they are directed”的省略形式。句意为“详细调查表明,多达百分之五十的病人没有按照医嘱服药”。
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