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

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

选项 A、suggested
B、tested
C、used
D、announced

答案A

解析本题难度不大，干扰项干扰性不大，propose和suggest都有“建议”的意思，最佳答案是A。

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职称英语理工类C级

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