关于现在完成时的几个问题It______ _______(become) a modern city since two years 这边好象是该填 has become.是吗?但是有人问能不能填 has being或has been.可不可以帮忙解释下呢The development of this city _____ __

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关于现在完成时的几个问题It______  _______(become) a modern city since two years  这边好象是该填 has become.是吗?但是有人问能不能填 has being或has been.可不可以帮忙解释下呢The development of this city _____  __
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关于现在完成时的几个问题It______ _______(become) a modern city since two years 这边好象是该填 has become.是吗?但是有人问能不能填 has being或has been.可不可以帮忙解释下呢The development of this city _____ __
关于现在完成时的几个问题
It______ _______(become) a modern city since two years
这边好象是该填 has become.是吗?但是有人问能不能填 has being或has been.可不可以帮忙解释下呢
The development of this city _____ ______ (cause) many problems.
这边是填have caused 还是has caused?为什么?

关于现在完成时的几个问题It______ _______(become) a modern city since two years 这边好象是该填 has become.是吗?但是有人问能不能填 has being或has been.可不可以帮忙解释下呢The development of this city _____ __
第一个问题当然应该用现在完成被动语态的has become,如果没有后面的since two years ago(我认为最后应该有一个ago,不然就该用for two years),也可以用was become.后面两个答案不是不行的,但是既然题目要求用become的时态填空,后面两个答案就不符合题意了.
第二个问题个人认为该填has caused.因为在这个句子中,development发展过程(指经济落后国家的现代工业的发展),是不可数名词,所以谓语动词该用三人称单数的has.这里有一个关于development的例句你可以看一下:The government has given 32 million pounds in food and development aid.意思是政府已在食品和发展项目的援助方面投入三千二百万英镑.

不可以,因为给你的词是become
has caused,因为The development是作为单数形式的

BECOME是个动词 前面怎么能加BE动词呢
HAS 前面DEVELOPMENT是单数