The day breaks ________the birds are singing.

The day breaks ________the birds are singing.
A、in that
B、which
C、on that
D、in which
【正确答案】：A
【题目解析】：in that是复合连词，引导状语从句，意为“在于，表现在，因为”，相当于一个由并列连词for连接的分句 ；句意：鸟儿在歌唱，因为天破晓了。