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

A number of theories have been proposed to explain the situation.A tested B used

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问题 A number of theories have been proposed to explain the situation.
选项 A tested
B used
C suggested
D announced
答案C
解析propose和 suggest是同义词，意思都是 “ 建议、提议、提出” ，用法略有不同，两者后面都可以跟动词的-ing形式，但是propose后面可以用动词不定式， suggest则不可以。可以说 we propose to have a meeting，但是不可以说 we suggest to have a meeting。 test 的意思是“测试、检验”， announce的意思是“宣布、公布”。
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