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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”，注意用法略有不同， 两者后面都对以踉动词的-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 meeting0 test的意思是测试、检验，announce的意思是宣布、公布。
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