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There have been a great number of telephone invention of in

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There have been a great number of telephone invention of in the last quarter of the 20th centry
number 那里为什么不能填development
There have been a great number of telephone invention of in
a great number of 意为许多的,修饰后面的telephone invention作句子的宾语部分,此句意为20世纪的最后25年间涌现了许多电话新发明.但此句中invention of 后面似乎还应该有词,或者是多打了一个of?