Careful surveys have indicated that as many as 50
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Careful surveys have indicated that as many as 50 percent of patients do not take drugs ________ directed.
A) like B) so
C) which D) as
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选D,
asdirected为astheyaredirected的省略形式,as引导方式状语,意为“象…”而like为介词,不可引导从句;当从句中的主语与主句中的主语一致时,从句中的主语和谓语动词的一部分可以省略,尤其含有be时,而保留其主要成分,如v.-ing,p.p.或adj.。
