1.____ she couldn’t understand was ____ fewer and fewer students showed interest in her lessons.
A. What; why B. That; what
C. What; because D. Why; that
［答案］ A
第一个下划线处的引导词引导主语从句并在该主语从句中充当宾语， 特指她所不理解的事情， 应填入关系代词型的引导词what； 第二个下划线处表示“因此……”(指因某种原因所造成的后果， 由why引导对应的名词性从句)而不是“为什么……”(指原因、 理由， 由because引导对应的名词性从句)， 应填入引导词why。
2.One reason for her preference for city life is she can have easy access to places like shops and restaurants.
A. that B. how C. what D. why
解析：that引导表语从句，在从句中that不充当任何成分，只起连接作用，BCD三个选项在从句中是要充当成分的。
3.—Are you still thinking about yesterday's party?
—Oh, that's ________.
A．what makes me feel excited
B．whatever I fell excited about
C．how I feel about it
D．when I feel excited
【答案】A
【解析】考查表语从句。what引导名词性从句时，充当句子的成分，可作主语、宾语或表语，此题中what引导的是表语从句，它在从句中作主语。
4.One advantage of playing the guitar is ______ it can give you a great deal of pleasure. A. how B. why C. that D. when答案：C解析：本题考查表语从句。句意“弹奏吉他的一个好处就是它能带给你很多快乐”，连接词在动词be后面引导表语从句，而且不表示任何意义，故选C。
5.—I'll ask the teacher about the attributive clause. I'm very puzzled about it.
—That's just ________ most of our classmates have doubt.
A．what B．Why C．where D．how
【答案】C
【解析】 句意：——我要问老师定语从句的问题。我对它感到很困惑。——那也是大部分同学有疑问的地方。where引导的是表语从句，have doubt on/about“怀疑……”，doubt后无介词，所以用where。