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________ excited Geoff Marcy most was whether there were planets in other solar system where life might exist.   
A.ItB.ThatC.What D.Why
C

试题分析:句意:使Geoff Marcy高兴的是,是否在太阳系的其他的行星上有生命存在。这里缺少主语从句的连词,并且连词在从句中做主语,排除ABD,that在从句中不做成分,why不能做主语。故选C。
点评:本题难度适中。判断从句中用哪个连词,需用记住连词的用法,在句中的作用,连词也是高考的热点,需要考生平时多练习。需要考生会分析句子成分理解句意。
即学即练:That is______I am not in favour of the plan.
A. It             B. That           C. What            D. Why
解析:D。句意:那是我不赞成这个计划的理由。
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