A number of theories have been proposed to explain the situation.

A．tested

B．used

C．suggested

D．announced

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参考答案

答案解析

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 t have a meeting。test 测试、检验，announce 宣布、公布。

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