it must be morning,____ the birds are singing

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it must be morning,____ the birds are singing
a.because
b.as
c.since
d.for
请简述四者区别

肯定是早上,因为鸟儿在歌唱.
for表示推断性原因.
A必然原因,回答why
B次于because的原因,语气没那么重.
C显然的原因（显而易见的原因.Since you are a boy,you should do it.)
是早上,鸟儿歌唱并不是必然原因的.
The spring has come,for the birds are sining.

The day must be breaking,_the birds have begun singing. The birds are singing ____ the tree.横线上可以填on吗 The day breaks , ____ the birds are singing.添as 还是for 给个理由先, There are some birds singing( )the trees (The sun is shining,birds are singing. The day breaks ______the birds are singing. the day breaks______the birds are singing. The birds are singing in the tree.对singing提问求一首英文歌.歌词好象有the sun is shining the birds are singing it's a there are some birds singing in the tree,这个句子有there be 句型,又有 there are some birds singing in the tree, 这个句子有there be 句型,又 The birds (are singing) in the tree括号部分提问