_____,she went back to her room.

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_____,she went back to her room.
a.there wasno cause for alarm
b.being no cause for alarm
c.without having cause for alarm
d.there being no cause for alarm

答案：D.
1.答案如果选A,则逗号前后是两个单句,但是缺少连词如because/so等连接；
2.答案如果选B,则要求be no cause for alarm的逻辑主语必须是句子的主语she,句意根本不通顺：人不可能是什么的起因；
3.答案如果选C,同样要求without having cause for alarm是句子主语she的伴随状态,句意同B一样不通顺；
4.答案D为独立主格结构,做句子的（原因）状语,且be no cause ofr alarm的逻辑主语并不是句子主语she,而且其前的独立主语there,两者构成there be句型,为正确答案.
再问：所以D前半句不是一句单句吗？这里there being是不是可以解释为由于的意思？
再答： D如果是单句的话，则动词be必须做句子谓语，但是它使用了being为非谓语，所以它不是个句子。选项要求为句子的原因状语，当然也可以是含有连词because等的原因状语从句。

_____,she went back to her room. （）noting to do,she went back to her room There being no cause for alarm,she went back to her room. 三个英语习题求解21.__,she went back to her room.A.There was no cause _,she went back her room. A.Without having cause for alarm B She wants _____ the key to her room. When she saw the clouds she went back to the house to ( )her she went to a room on the first floor where she met her futu Everyone went to the party ____Maria. She has gone back her Then she went back to her rocking chair and sat there rockin she went to bed after her mother came back (该同义句) My mother went to JiNan yesterday ,she hasn't _____ back yet