Their factory has developed a kind of ______to help people walk.

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问题 Their factory has developed a kind of ______to help people walk.

选项 A、the machine
B、machines
C、machine

答案C

解析句意:他们工厂已经研发出了一种可以辅助人行走的机器。本题考查的是短语a kind of，后面的名词用单数，名词前不加冠词。

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