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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