Careful surveys have indicated that as many as 50 percent of patient do not take

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问题 Careful surveys have indicated that as many as 50 percent of patient do not take drugs ______directed.

选项 A、what
B、so
C、which
D、as

答案 D

解析根据语法结构，空格处需用一个能引导方式状语的连词，因主从句中的主语一致，故从句中省略了主语和be动词，而在四个选项中可以引导方式状语从句的只有[D]。

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