_______ we have planned ahead might change when we put it into practice.A.WhateverB.WheneverC.WhoeverD.However
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A解析试题分析：考查主语从句：根据句意：当我们实施的时候，提前计划的事情可能会改变。用whatever引导主语从句，相当于anything that，B. Whenever无论何时，C. Whoever 凡是…人，无论谁，D. However无论怎样，选A。考点：考查主语从句
点评：疑问词+ever 可以引导状语从句，相当于no matter+疑问词，也可以引导名词性从句，whatever相当于Anything that，whoever相当于anyone who。