We must start early,_____ we have a long way to go.A.because

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We must start early,_____ we have a long way to go.A.because B.since C.for D.while 应

C更为确切
[辨析]since,because,for 词语辨析
because表示原因的语气最强,常表示必然的因果关系,从句是全句的重心,它引导的从句一般放在主句的后面；回答以why引起的特殊疑问句,只能用because.如：
He is absent today because he is ill．
他今天缺席,因为他病了.
—Why didn't he come?
—他为什么没来?
—Because he had an important meeting to attend．
—因为他有个重要的会议要参加.
since意为“既然”,表示对方已经知晓,无需加以说明的原因或事实（有时为天经地义的事实或格言、谚语等）,语气比because稍弱,全句重点落在主句上.如：
I'll do it for you since you are busy．既然你忙,我来替你做吧.
for是并列连词,它的语气最弱,常用来补充说明理由或提供一种解释.它引导的句子不能放在句子的开头.如：
We must leave now,for the film begins at seven．我们得走了,因为电影七点钟开始放映.

We must start early,_____ we have a long way to go.A.because we must start early,____ we have a long way to go we must start early,____we have a long way to go.Abecause Bf I always believe we have a long way to go. We have a long way to go,so we have to walk_____(much）. we stil have a long way to we have a long way to go,（） we?括号里添什么? we still have a long way to go to solve all problems 的同义句 we live—— now because we have changed the way we live A.long we still have a long way to go,翻译的正式一点,怎么翻? This is wonderful,but we still have a long way to go. 求翻译We still have a long way to go even after we get to San F