8 The invention of __A_wheel is a great contribution to ____man.A the \ B \ \ C a the D \ the请高手给个确切的答案,在讲下其中的语法知识,为什么不选D呢,

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8 The invention of __A_wheel is a great contribution to ____man.A the \ B \ \ C a the D \ the请高手给个确切的答案,在讲下其中的语法知识,为什么不选D呢,
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8 The invention of __A_wheel is a great contribution to ____man.A the \ B \ \ C a the D \ the请高手给个确切的答案,在讲下其中的语法知识,为什么不选D呢,
8 The invention of __A_wheel is a great contribution to ____man.
A the \ B \ \ C a the D \ the
请高手给个确切的答案,在讲下其中的语法知识,为什么不选D呢,

8 The invention of __A_wheel is a great contribution to ____man.A the \ B \ \ C a the D \ the请高手给个确切的答案,在讲下其中的语法知识,为什么不选D呢,
第一个空要用定冠词,表示一种泛指;而第二个空不能用冠词,因为man的意思是“人类”.

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