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___ a hot day,I decided to go for a swim.A what B it being C

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___ a hot day,I decided to go for a swim.A what B it being C Being D have being 为什么?
选C.
首先你发现逗号前后有两句句子且无连接词(高中英语老师总结为“逗号无连词”),马上反应出这里考的是“独立主格”语法现象.“独立主格结构”是由名词或代词作为逻辑主语,加上分词(此句就是)、形容词、副词、动词不定式或介词短语作为逻辑谓语构成.因为这种结构在形式上与主句没有关系,所以通常称为“独立主格结构”.
独立主格结构主要用于描绘性文字中,其作用相当于一个状语从句,常用来表示时间、原因、条件、行为方式或伴随情况等.例如:
1) 表示时间 The meeting being over,all of us went home.开完会后我们都回家了.the meeting being over相当于when the meeting was over
Her work done,she sat down for a cup of tea.她干完了活,坐下来喝茶.her work done相当于when her work was done
2) 表示条件 The condition being favorable,he may succeed.若条件有利,他或许能成功.If the condition is favorable
3) 表示原因 There being no taxis,we had to walk.没有出租车,我们只好步行.Since there was no taxis,He wrapped her up with great care,the night being dark and frosty.夜又黑又冷,所以他把她裹得严严实实的.as the night was dark and frosty
4) 表示伴随情况 Almost all metals are good conductors,silver being the best of all.几乎所有的金属都是良导体,而银则是最好的导体.(=Almost all metals are good conductors,and silver is the best of all.)
5) 表示补充说明 We redoubled our efforts,each man working like two.我们加倍努力,一个人干两个人的活.
特别的在表示天气时主语可用it,此句就是.可以等于The weather being hot,..