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用括号中所给单词的适当形式填空. The of aircraft made it convenient for us to travel.

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用括号中所给单词的适当形式填空. The of aircraft made it convenient for us to travel.

用括号中所给单词的适当形式填空。

The ________ (invent) of aircraft made it convenient for us to travel.

试题答案

答案:invention