1. before a problem can be solved, it must be obvious ______ the problem itself is. (2011·湖南卷31)
a. what b. that
c. which d. why
【解析】选a。空白处后句子缺表语。因此不能选b。b中的that 只起引导作用，无实意。而该句选what既起了引导作用，又作了句子成分表语。
2. it is still under discussion ______ the old bus station should be replaced with a modern hotel or not. (2011·重庆卷22)
a. whether b. when
c. which d. where
【解析】选a。该句中it作形式主语，真正的主语是由whether…or not引导的从句。句意：是否这个旧车站该由现代宾馆取代还在讨论中。
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