专题15 主语从句-2020-2021学年高二英语期末备考语法专题突破

主语从句 1. It is a truth well known to all ______China has become one of the strongest countries in the world. A. where              B. which              C. that              D. who 【答案解析】 C 【详解】考查主语从句。句意：众所周知，中国已成为世界上最强大的国家之一。分子句子可知，此处是一个主语从句，it是形式主语，that引导的是真正的主语。故选C。 2. It is no use _____ for your mistakes now. _____ you need to do is correct them as soon as possible. A. crying; What              B. crying; That              C. to cry; That              D. to cry; What 【答案解析】 A 【详解】考查固定句型和主语从句。句意：现在为你的错误哭泣是没有用的。你需要做的是尽快纠正它们。It is no use doing sth.做某事是没有用的，该句型是固定句型；_____ you need to do是一个主语从句，引导词在从句中作宾语，表示“你需要做的事情”，用what引导该从句。故选A。 3. _____ you can succeed or not mainly depends _____ how hard you work at it. A That; on              B. What; upon              C. Whether; upon              D. If; on 【答案解析】 C 【详解】考查名词性从句和固定短语。句意：你能否成功取决于你有多努力。句中出现or not，分析句子可知，该题考查的是whether引导的主语从句，故A选项和B选项排除，引导主语从句位于句首时不能用if，故D选项排除。depend on/upon为固定短语，意为“取决于……”。故选C项。 4. ______ is surprising to us is that Tom, for ______ English was once boring, can speak English fluently as though he were a native speaker. A. What; whom              B. What; whose C. It; whose              D. As; whom 【答案解析】 A 【详解】考查主语从句和定语从句。句意：让我们惊讶的是，汤姆对他来说英语曾经是枯燥的，现在可以流利的说英语好像是英国本土的人。通过分析句子结构，可知这个句子中包含一个主语从句，和一个非限制性定语从句。且引导词在主语从句中作主语，表示“什么”的含义，故用what。介词 + 关系代词引导的定语从句，定语从句的主语是English，这里表示“对于某人来说”，需要for的宾语，指人只能用whom。故选A。 5. _________ is known to all is that the earth is smaller than the sun. A. As              B. What C. It              D. Which 【答案解析】 B 【详解】考查名词性从句。句意：众所周知，地球比太阳还小。复合句的主语是一个名词性从句，从句没有引导词和主语，表示“所……的（事）”，故用what引导，其双重作用，故选B。 【点睛】英语“众所周知”的表达方法：1. 用as引导非限制性定语从句：As we all know；As everyone/everybody knows；As is known to us all；As is known to everyone/everybody 2. 用It做形式主语，that从句做真正主语：It is known to us all that从句；It is known to everyone/everybody that从句 3. 用what引导主语从句，后用that引导表语从句：What is known to us all is that从句；What is known to everyone/everybody is that从句 6. _______ is known to us all that the old scien