(单选题)
The day breaks, ______ the birds are singing.
A.since
B.for
C.because
D.so as
参考答案：B
参考解析：
考查for引导的原因状语从句。句意：天亮了，鸟儿在唱歌。若选A项或C项，则强调The day breaks的直接原因或者显而易见的原因就是the birds are singing，显然这是不成立的，只有for引出的句子作为一种附加说明才成立。故选B。
知识点：
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