thousands of families from the earthquake-stricken area have moved into new houses is exci

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(答案→)A. That
B. What
C. Which
D. It
解析：考察主语从句。本句中的that引导的是主语从句，that在句中不充当任何成分，没有任何句子意义。句意：来自地震袭击地区的成千上万的家庭搬进新家这真是一个令人兴奋的消息。What和which在句中做主语，宾语，表语。It不能引导主语从句。故A正确。