—What has made him look like lacking sleep?—_______ his wife is ill and he has to get up several times a night to attend to her.A.ForB.BecauseC.ThatD.What
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C解析试题分析：考察名词性从句关系词 句意为：---是什么导致他看上去缺乏睡眠呢 ----他的妻子病了，他得每天起夜几次去照顾他生病的妻子That做为名词性从句的引导词，起连接作用，本身无实际意义。从语法关系上看，that从句相当于名词的功能。根据上句what可判断，下句应是一个在语法上充当主语的句子成分。故C选项符合题意考点:考察名词性从句关系词
点评：考生在解答此类型题目，应从上下句的句法关系着手分析，切不可‘望句形生