有一读者问： 有这样一道选择题：
(1)_____, we did not go to the museum yesterday.
A. Being a very cold day B. It was a very cold day
C. Due to a very cold day D. Owing to a very cold day
标准答案是A，其前可以省去it吗？
标准答案是对的。A并不是一单纯的分词短语，而是being前省去非人称代词it的独立分词结构，用以表示原因。这种省去it的独立分词结构并不罕见，再如：
(2)Being Sunday , the shops were all closed.
(3)Being summer , the rivers were open and navigable.
有时并不省去it，如：
(4)It being dusk , I think nobody has perceived me.
B 只表时间。如用以表原因，全句须改写为：
(5)It was a very cold day yesterday and so we did not go to the museum. （当然也可说It was very cold yesterday...）
最后，请注意独立分词结构一般只用在笔语中。
