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

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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