____ is to be done is ______ to carry it out smoothly since the decision has been made．A.What; howB.Where; howC.When; whatD.Where; what
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A解析试题分析：考查从句，从句is to be done缺少宾语，所以选What，句子to carry it out smoothly不缺少成份，所以选how，句子意思“自从下定决心将要做什么是怎样顺利执行”，所以选A考点：考查从句
点评：做从句题时，首先看从句是否缺少成份，如果缺少成份就选择关系代词，关系代词不仅起引导作用而且做成份；如果不缺少成份，就选择关系副词，关系副词不做成份，只起引导作用。