It is very____ for her to arrive late.A rarely B a rare C rare但原因是什么?

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It is very____ for her to arrive late.A rarely B a rare C rare但原因是什么?

It is very____ for her to arrive late.A rarely B a rare C rare但原因是什么?
It is very____ for her to arrive late.A rarely B a rare C rare
但原因是什么?

It is very____ for her to arrive late.A rarely B a rare C rare但原因是什么?
这是一个主系表结构,缺少的是表语部分.表语可以由名词或形容词来充当,但此句中明显缺少个形容词.
实际真正的主语是“她来晚了”,由“it”做形式主语.