单项选择题

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
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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
单项选择题
A river ______ through the narrow wooded valley below.
A. extends
B. pours
C. expands
D. twists
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