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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