单项选择题

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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Professor Smith's dedication to ______ earned him the respect of both his colleagues and students.
A. being taught
B. be taught
C. teach
D. teaching
单项选择题
—When has the country been open to international trade —1960, I suppose.
A. Since
B. In
C. From
D. After
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