The day breaks,__the birds are singing.为什么填for,不填so

The day breaks,__the birds are singing.为什么填for,不填so The day breaks ______the birds are singing. The day breaks , ____ the birds are singing.添as 还是for 给个理由先, 英语选择：Now day breaks,-----the birds are singing Now day breaks,____the birds are singing. The day breaks __ the birds are singing.A.or B. Listen!Many birds are singing()the tree 填什么介词 the day breaks______the birds are singing. The day has broken,for the birds are singing.这句话是不是错了?是不是The when day breaks,you can hear a lot of birds singing( )the tr The birds are singing ____ the tree.横线上可以填on吗 The day broke for the birds were singing.