每日一练：职称英语理工类每日一练(2015-1-16)
【单选题】
A number of theories have been proposed to explain the situation.
A tested
B used
C suggested
D announced
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每日一练：职称英语理工类每日一练(2015-1-16)
【单选题】
A number of theories have been proposed to explain the situation.
A tested
B used
C suggested
D announced
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