单项选择题

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

A．what
B．so
C．which
D．as
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单项选择题
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A．has
B．did
C．was
D．would
单项选择题
He is holding a ______ position in the company and expects to be promoted soon.
A．subordinate
B．sequential
C．successive
D．subsequent
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