The day breaks，______ the birds are singing.
A．becauseB．a(chǎn)sC．sinceD．for
D
若選A、B、C，強(qiáng)調(diào)The day breaks(天亮)的直接原因或者顯而易見的原因就是the birds are singing(鳥叫)，顯然這是不成立的，只有for引出的句子作為一種附加說明才成立。
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