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

解析本题是对动词的考查。题干:一系列的理论被提出来解释现状。题干划线词propose意为“计划,向……提议,提出”。四个选项:suggest意为“建议,暗示”,test意为“实验,测试”,use意为“利用,使用”,announce意为“宣布,预示”,因而A为正确答案。
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