单项选择题

A number of theories have been proposed to explain the situation.

A. suggested
B. tested
C. used
D. announced
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单项选择题
We explored the possibility of expansion at the conference.
A. offered
B. investigated
C. included
D. accepted
单项选择题
His shoes were shined to perfection.
A. cleared
B. washed
C. polished
D. mended
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