____,the library was closed.

题目

____,the library was closed.
A.Being Sunday B.It be Sunday.C.Sunday as it was D.As it was Sunday
为什么是D?其他3个错在哪里?

答案

D选项中的As表示原因,即“因为是星期天,图书馆关门”.
C选项的结构为“名词/形容词+as+句子其他成分”,这时as解释为“尽管”.
B选项显然是错误的,不能直接用be动词在句子中.
A选项构成分词结构,但是在这儿being的逻辑主语是句子的主语the library,是不对的,因为不能说成The library was Sunday,所以也不能选.
因此,答案只能是D.