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一道英语选择题---- , we decided to leave at once, as we didn't want

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一道英语选择题
---- , we decided to leave at once, as we didn't want to risk missing the bus.
A As it being pretty late
B It being pretty late
C It was being pretty late
D Being pretty late
请帮忙讲解一下为什么. 谢谢!
首先注意到逗号后面的句子已经有谓语decided,说明它是主句,其他句子若无连词引导不能再出现谓语,排除C;A中的as时表示原因的连词,后面应该引导完整句子,所以A是错的;再看D,语法并无错,但这种无主语的非谓语结构,其逻辑主语应该和全句的主语一致,全句主语是we,显然不合逻辑.故选择B,逻辑主语it代表抽象的时间概念,语法亦无错.