It's a busy street.(改为同义句） It's () a () street.并说明原因...

It's a busy street.(改为同义句）
It's (such) a (busy) street.
不能用so,so后面职能是跟的形容词,不能跟名词性词组；而such后面可跟名词性词组,所以用such.
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