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A．However a serious problem B．What a serious problem C．However serious a problem D．What serious a problem 答案 C [句意：不论你的问题有多严重，你都应该鼓起勇气，接受挑战。考查状语从句。分析题干可知逗号前是让步状语从句，what不能用来引导状语从句，所以排除B、D两项；however＋adj.＋a/an＋单数名词＝whatever＋a/an＋adj.＋单数名词。故C项正确。] ②(2010·上海卷)________you may have, you should gather your courage to face the challenge. A．However B．Whatever C．Whichever D．Whenever 答案 A [句意：不管你多么努力，如果不减少食量，想要减肥会很难。考查让步状语从句。根据设空后的副词hard可知答案为however, however hard相当于no matter how hard。whatever无论什么，与名词连用；whichever无论哪一个；whenever无论什么时候。] ③(2017·湖南卷)________hard you try, it is difficult to lose weight without cutting down the amount you eat. A．whichever B．whenever C．whoever D．wherever 答案 C [句意：为了表示我们的尊敬，无论与谁握手，我们通常得摘下手套。shake hands with sb与某人握手，本句中的with后缺少宾语，结合句意选C项，whoever在句中引导让步状语从句。] ④(2011·重庆卷)To show our respect, we usually have to take | 
