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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，都是“建议，提议，提出”的意思，注意用法略有不同，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 “测试，检验”，announce “ 宣布，公布”。
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