Question

__,we had to hire a taxi,for we missed the last bus.

A. As it being pretty late
B. It being pretty late
C. It was being pretty late
D. Being pretty late
为什么选B
分析下句子

Answer 1

A 有语法错误， 除非说： As it was pretty late
由于已经很晚的逻辑主语是It(指时间）， 而句子的主语是we, 所以如果选D, 逻辑主语就不一致了！
C 项本身没问题， 但如果后接__,we had to hire a taxi,for we missed the last bus这个题干，就不知道是什么句子类型了！
选B 是独立主格结构做原因状语

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As it was pretty late 什么意思 那个As

追答

因为---引导原因状语从句
As it was pretty late “【由于】已经很晚了”

Answer 2

It being pretty late=As it was pretty late.
此结构叫做独立主格结构，是因为主句的主语与这个结构的逻辑主语不一致，所以独立出现。其结构为：
主语+分词/动词不定式/介词短语
例如：Book in hand, he went into the room.