Without the friction between our feet and the ground, we may not be able to walk.

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问题 Without the friction between our feet and the ground, we may not be able to walk.

选项 A、wouldn’t be
B、were
C、were not
D、can’t be

答案A

解析 这句话的意思是:如果没有脚和地之间的摩擦,我们就不能行走。本句属于隐含式虚拟语气。句中without短语相当于一个与现在事实相反的虚拟条件句。在without引导的虚拟语气中,表示与现在事实相反时,谓语动词为would/could/might(not)do something;表示与过去事实相反时,谓语动词结构为would/could/might(not)have done something;表示与将来事实相反时,谓语动词为would/could/might(not)do something。此处与现在事实相反。答案为A。
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