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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