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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