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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