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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