A number of theories have been proposed to explain the situation.A: tested B:sug

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

选项 A: tested
B:suggested
C:used
D:announced

答案B

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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