A) This invention is of great importance to the progress of society. B) It is said that celebration will be postponed to next we

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问题 A) This invention is of great importance to the progress of society.
B) It is said that celebration will be postponed to next week.
C) Our office has recently converted to a new computer system.
D) It ’s well - known that education is the foundation of a prosperous country.
最近我们办公室更换了新的电脑系统。

选项 A、 
B、 
C、 
D、 

答案C

解析
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