A number of theories have been proposed

tikufree2019-12-17 14

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

选项 A: testedB:suggestedC:usedD: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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