_____ 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，相當于由于。A選項為非謂語結構的短語，其主語要和后面的主語保持一致。而A中的主語是今天，后面的主語是the libiry.所以不選A

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D. As it was Sunday，表原因，相當于由于。

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D

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being Sunday the library was closed.這樣的句子是不通的.首先這個句子的時態是過去時,然后,很明顯這是一個表示原因的狀語從句,而你選的being Sunday根本不能表示原因,所以該選的是D

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D. As it was Sunday，表示原因，相當于由于。