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

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

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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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