题目

题型：不详难度：来源：

---- 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．For

B．Because

C．That

D．What

答案

C

解析

试题分析：考察主语从句。本题指的that引导主语从句That his wife is ill and he has to get up several times a night to attend to her.在句中不充当任何成分，只起引导和连接作用。AB不能引导主语从句，what要在句中作主语，宾语或者表语。句意：—什么事情让他看起来如此缺少睡眠？—他的妻子生病了，他不得不起床好几次来照顾她。故C正确。
点评：主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。解答这类题目，关键在于分析清楚句子结构。通过判断引导词在从句中所作的成分及意义，来选择正确的引导词。连接主语从句的从属连词主要有that, if, whether，和疑问词（what how where when ...)。that引导表示陈述句的主语从句，if和whether，whether...or not引导表示“是否”，引导一般疑问句。连接代词主要有who,whom,whose,what,whoever,whomever,whosever,whatever,whichever等。连接代词一般指疑问，但what, whatever除了指疑问外，也可以指陈述。连接副词主要有when, where, why, how, whenever, wherever, however等.