Their factory has developed a kind of ______to help people walk.A、the machineB、

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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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