____ is Britain now used to be three different countries and over many years the three countries became one.A It B What C Where D As为什么不选A?

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____isBritainnowusedtobethreedifferentcountriesandovermanyyearsthethreecountriesbecameone.AItBWhatCW

____ is Britain now used to be three different countries and over many years the three countries became one.A It B What C Where D As为什么不选A?
____ is Britain now used to be three different countries and over many years the three countries became one.
A It B What C Where D As
为什么不选A?

____ is Britain now used to be three different countries and over many years the three countries became one.A It B What C Where D As为什么不选A?
主语从句,what is Britain now作主语.你可能有点混淆it作形式主语时的区别.举个例子
主语从句---What I said was important.（翻译：我所说的很重要）.慢慢体会what放在句首的味道.可以反过来读 I said what（当然英语中没这种说法,是句子成分划分时才用,主语I 谓语said 宾what）.what I said可以看成一个句子,可以在心里悄悄的当做It（形式主语it） ,此话就简单为it is important.简单吧?
另外有些特殊句式必须用It作主语.It is +adj+ to do sth
It is important to learn English well.
建议：英语多读课本多背书,读到一定境界直接就知道.无需太花功夫纠缠语法.

因为选A是错误的，所以不选A了
what is Britain now是作主语，表示：我们现在所说的英国

这是一个主语从句啊。 what is british now 是主语，所以不能用形式主语it

what引导的是主语从句。句子中缺少成分所以用what` it引导的是形式主语句~要看句中有没有它指代的部分，此句中没有，所以用what·

Mark ____ in China for 10 years and now he teaches Chinese in Britain.A.has worked B.worked C.hadMark ____ in China for 10 years and now he teaches Chinese in Britain.A.has worked B.worked C.had worked D.is working选B还是选C？给出理由。 Is ____(snow) heavily now 25 Mark ____ in China for 10 years and now he teaches Chinese in Britain.A.has worked B.worked C.had worked D.is working请给出理由没有理由的免谈 ____ is Britain now used to be three different countries and over many years the three countries became one.A It B What C Where D As为什么不选A? =Mark ____ in China for 10 years and now he teaches Chinese in Britain.A.has worked B.worked Mark ____ in China for 10 years and now he teaches Chinese in Britain.A.has worked B.worked he is feeling ____(well) now. he is feeling ____(well) now. The island of Great Britain is made up of ___ ____ ,and___? In history,the Great Britain is the most powerful country,and now,the united states is the most She is now in Britain.I hope everything is getting on well_____her.A.to B.about C.for D.with lt is two years since l started to study in Britain.(意思不变) Two years ____ ____since l start to study in Britain Wang Mei is working now.同义句转换=Wang Mei is ____ ____ now. 英语翻译That most of these are now threatened and may disappear is a serious matter to the people in Britain now he is illNow he is ____(bad) ill. The addressee is in Britain. wo often ___swimming in the river last summerBeckham is a ____(Britain)foot ball playerWhen was his mother_____(bear)? wo often ___swimming in the river last summerBeckham is a ____(Britain)foot ball playerWhen was his mother_____(bear)?