notonlybutalso与moreover的用法上海高考题中完形填空中有一句,Revisionisnotjustanafterthoughtthatgetsonlyasmuchtimeasyouhaveattheendofanassignment.___56___,itisamajorstageofthewritingprocess,andwriters

　　notonlybutalso与moreover的用法

　　上海高考题中完形填空中有一句,Revisionisnotjustanafterthoughtthatgetsonlyasmuchtimeasyouhaveattheendofanassignment.___56___,itisamajorstageofthewritingprocess,andwritersreviseeverystepoftheway.

　　56.A.HoweverB.MoreoverC.InsteadD.Therefore

　　空格里面答案填的是Bmoveover,但是为什么不能选C呢,

　　not.but,确实是这样的,根据语义,应该选instead,请高手分析下.