单项选择题

Professor Clark continued his research work and disregarded his colleague's advice.

A. ignored
B. explored
C. realized
D. recognized
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单项选择题
Capital punishment was abolished some years ago in some states of the U. S.
A. created
B. decorated
C. improved
D. eliminated
单项选择题
Her voice is distinct and unique. You can tell her voice immediately.
A. common
B. species
C. specific
D. special
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