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

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

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

答案A

解析本句意思：很多理论被建议去解释那种情况。propose意为“建议”，与suggest（建议）意思相同。test测验；use使用；announce宣布。

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