The day must be breaking,_the birds have begun singing.A.because B.as C.for D.since 为什么选C不选B还有这四个词有什么区别，

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The day must be breaking,_the birds have begun singing.A.because B.as C.for D.since 为什么选C不选B还有这四个词有什么区别，

The day must be breaking,_the birds have begun singing.A.because B.as C.for D.since 为什么选C不选B还有这四个词有什么区别，
The day must be breaking,_the birds have begun singing.
A.because B.as C.for D.since
为什么选C不选B
还有这四个词有什么区别，

The day must be breaking,_the birds have begun singing.A.because B.as C.for D.since 为什么选C不选B还有这四个词有什么区别，
天一定破晓（天亮）了,因为鸟们已经开始鸣唱了.
以下资料供参考：
1.because表原因,既可以用于首句,也可以用于末句.
表示原因部分在整个句子中占有很重要的地位.
I read this book because I like it.我读这本书,因为我喜欢它.
2.as 表示已经知道的原因.
As we read,we learn.因为我们阅读,可以学到（知识）
3.for 在句子结尾给出原因.如本句
4.since,和2原因相同,但用法要正式的多,

The day must be breaking,( for )the birds have begun singing.翻译 must be the water I must be the must be the money What a cold day The temperature must be ( )zero括号里的应该填什么 when you drive on the s__road on a rainy day,you must be more careful. It must be beautiful lovely day Must Be The Ganja 歌词 翻译must be the past THE IDEA MUST BE BEST! MUST BE THE MUSIC怎么样 The flowers must ________(water)every day. Our class are planning ___one-day trip tp West Hill.___trip must be fun ,i think.A the A B an TheC a The D the The the flowers must be watered every day by we这句话对不对.如题 原意是要把原句改为被动语态 原句为,we must water the flowers every day Time must be a valid time of day it must be a blow day哪儿错了 keeps hunrrying 和 around all day 和 must be help That'll be the day.