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____ is Britain now used to be three different countries and

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____ 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.