英语选择:Now day breaks,-----the birds are singing

问题描述:

英语选择:Now day breaks,-----the birds are singing
The day breaks ______the birds are singing.
A:because B:and C:since D:for
选择并说明理由!

D 天亮了因为小鸟在歌唱(一种预兆) (仅供参考)