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

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
解析题干意思为：一些理论被提出用于解释这种情况。propose：提议，建议。 test：检验，探测；suggest：建议，提议；use：使用，利用；announce：宣布，通告。经过分析，只有选项B与题干意思相符。
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