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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