1、单项填空1It has been proved _ eating apples every day is good to the health.Aif BbecauseCwhen Dthat解析：选 D。考查 it 作形式主语时主语从句的引导词。句意：已经证实，每天吃苹果对健康有益。此句中，it 为句子的形式主语，而 proved 后面的从句才是该句的真正主语；该主语从句中 eating apples every day is good to the health.并不缺少成分，所以只需用 that引导即可。2_ is known to us is that the 2016 Olympic
2、Games will take place in Rio.AIt BWhat CAs Dwhich解析：选 B。考查主语从句的引导词。句意： 我们都知道 2012 年的奥运会将在伦敦举行。What is known to us 为主语从句，what 为连接词并在从句中作主语。句中 that 引导表语从句。3It is not immediately clear _ the financial crisis will soon be over.Asince BwhatCwhen Dwhether解析：选 D。考查主语从句的引导词。句意：金融危机是否很快就结束还不清楚。根据句意选 whether。
3、4It is suggested that we _ to the park later.Awill go BwentCgo Dhas gone解析：选 C。主语从句中的虚拟语气。句意：我们被建议稍晚一点去公园。此处suggest 意为“建议” ，所以从句中要用“should 动词原形 ”的虚拟语气。5The question is _ the film is worth seeing.Aif BwhatCwhether Dhow 解析：选 C。考查表语从句引导词。句意：问题是这部电影是否值得一看。根据句意应选 C，if 不能引导表语从句。6The reason _ I have to go
4、is_ my mother is ill in bed.Awhy; why Bwhy; becauseCwhy; that Dthat; because解析：选 C。考查定语从句及表语从句。句意：我要走的原因是我妈妈生病在床了。修饰 reason 的定语从句不缺主语、宾语、表语，故选 why 作状语；reason 作主语，常用that 引导表语从句。7_ I cant understand is _ she wants to change her mind.AWhat; why BWhich; howCThat; why DWhat; because解析：选 A。 考查主语从句及表语从句。句意
5、：我不能理解的是她为什么想改变主意。What 在主语从句中作 understand 的宾语；why 在表语从句中作状语。8_ his dream of going to college will come true is uncertain.AThat BWhetherCIf DEven if解析：选 B。 考查主语从句。句意：他上大学的梦想能否实现还不确定。根据uncertain 可知主语是表示疑问，故排除 A。if 引导主语从句不能置于句首。9_ is a fact that English is being accepted as an international language. AThere BThisCThat DIt解析：选 D。 考查 it 作形式主语。句意：英语已成为国际性的语言是个事实。所需词置于句首，同时后面有 that 从句( 逻辑主语)，可见这里应该用形式主语 it。10_ has helped to save the drowning girl is worth praising.AWho BThe oneCAnyone DWhoever解析：选 D。考查主语从句。句意：任何帮助救溺水女孩的人都值得表扬。whoever anyone who 意为“无论谁 ”，表泛指。
