There have been a great number of telephone invention of in the last quarter of the 20th centrynumber 那里为什么不能填development

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There have been a great number of telephone invention of in the last quarter of the 20th centrynumber 那里为什么不能填development
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 the last quarter of the 20th centrynumber 那里为什么不能填development
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?

这里应该是固定搭配啊，a number of

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新东方济南全科辅导学校告诉你：
前面有个a就不行了
新东方济南学校：
中学部特设优能学习（一对一强化全科专业课程），精品班（小班全课教学），18年经验积累，让你的学习备受老师关注，我们做得更好；
考研考公、出国留学，报考指导、辅导学习加签证一站式服务，独家授权，我们更专业。
泡泡少儿英语，特色亲子教学，家庭教育高峰论坛，让您带着孩子提前飞翔。

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have been there 中文翻译 have been there what changes___in your life?A.is there B.are there C.have been there D.have there been There have been a couple where there's been 请翻译下,并且分下下语法 I never there before.A.have;been to B.have;been C.have;gone to D.have;gone 单选：() you () there before A.Have ...been B.Have ...gone C.Have ...been to D.Have..gone to. have been there 还是 have been to there Have you been in there?写成Have you been there? i have always been there i have never been there there must have been a million dollars there.为什么有两个there? They have a____ been there There have been 一般疑问句 have you brother been there? there must have been a storm there.__.a there couldn't be b.I think there was do you have a book?能回答i have?have you been theredo you have a book?能回答i have?have you been there?回答什么? there have been a great number of accidents lately.这句话不加been行么? I have just been to a shopping center with Michael,I've never been there before , I have been there,have been 是have been in还是have been to的缩写?