We have got only five books for the children__we need ten.So I'm afraid they will have to share.

问题描述:

We have got only five books for the children__we need ten.So I'm afraid they will have to share.
A.because B.since C.when D.once
thanks!

C
当我们需要10本书的时候我们只有5本书给孩子,所以恐怕他们要分享了
只有C符合句意
希望能够帮到楼主