_____ the library was closed.

_____ the library was closed.A. being SundayB. it be SundayC. Sunday as it wasD. As it was SundayThe key is dWhy not a

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D.As it was Sunday,表原因，相当于由于。A选项为非谓语结构的短语，其主语要和后面的主语保持一致。而A中的主语是今天，后面的主语是the libiry.所以不选A

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D. As it was Sunday，表原因，相当于由于。

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D

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being Sunday the library was closed.这样的句子是不通的.首先这个句子的时态是过去时,然后,很明显这是一个表示原因的状语从句,而你选的being Sunday根本不能表示原因,所以该选的是D

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D. As it was Sunday，表示原因，相当于由于。