2. 外语
  3. Careful surveys have indicated that as many as 50 percent of patient do not take drags ______ directed.

Careful surveys have indicated that as many as 50 percent of patient do not take drags ______ directed.

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问题 Careful surveys have indicated that as many as 50 percent of patient do not take drags ______ directed.
选项 A、what
B、so
C、which
D、as
答案D
解析 根据语法结构，空格处需用一表示方式的连词，因主从句中的主语一致，故从句中省了主语，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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