A Without the friction between B their feet and the ground, people C will D in no way be able to walk.

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问题 A Without the friction between B their feet and the ground, people C will D in no way be able to walk.

选项 A、 
B、 
C、 
D、 

答案C

解析 应改为would,介词without引导虚拟条件,主句应用虚拟语气。
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