who it is 是错误的。
Who is it?是一个由who引导的特殊疑问句。
而当who引导宾语从句时，who后面用陈述句，即who it is.
例：He asked who he was.
Who is he? He is Tim.
who is it 是个疑问句，可以单独使用；who it is一般是个从句，不能单独使用。
who it is中，who是is的宾语，代指人。
who is it与who it is
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who it is 是错误的。
Who is it?是一个由who引导的特殊疑问句。
而当who引导宾语从句时，who后面用陈述句，即who it is.
例：He asked who he was.
Who is he? He is Tim.
who is it 是个疑问句，可以单独使用；who it is一般是个从句，不能单独使用。
who it is中，who是is的宾语，代指人。
