并列连词and,or,either...or,both...and,notonly...butalso,aswellas

　　表转折对比,but,yet,however,nevertheless,not...but

　　表原因,for,because,since,nowthat,consideringthat,seeingthat

　　结果,so,hence

　　从属连词,when,while,as,after,before,since,until,till,assoonas,once,

　　表条件,ifevenif,unless,incase

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