Aof the many machines Binvented in the late nineteenth century, none had Ca great impact Don the United States economy than the

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问题 Aof the many machines Binvented in the late nineteenth century, none had Ca great impact Don the United States economy than the automobile.

选项 A、 
B、 
C、 
D、 

答案C

解析 a great改为greater。分句意在表达比较级关系,因此使用greater。
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