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A number of theories have been proposed to explain the situation.
A: tested
B:suggested
C:used
D:announced
B:suggested
C:used
D:announced
参考答案
参考解析
解析：本句意思：一系列的理论被提议来解释这个情况。propose意思为“提议，建议", suggest’的意思与其最接近。
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