Since its (invent) ______, the telephone has become one of the most important telecommunication instruments in the world.

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问题 Since its (invent) ______, the telephone has become one of the most important telecommunication instruments in the world.

选项

答案invention

解析 本题考查词性变换。介词since后需接名词,构成介宾结构。同时,根据形容词性物主代词its,也可知需要填入动词invent的名词形式invention。
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