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