5. -- He got his first book published. It turned out to be a bestseller.

　 -- When was that?

　 -- It was in 2000 ______he was still in college.

　　 A. that　　 B. then　　　 C. which　　　 D. when

　 你的答案是不是ACAAA？如果是这样，那你只回答对了第二个题目，而另外的四个题都错了，因为它们都与that无关，这是最典型的陷阱题。我们不妨来仔细分析一下：

　 第一题，你想选择that，那你一定是认为这是个结果状语从句，而that后面everybody likes to read少了“it”，因此，这不是状语从句，而是由as引导的限定性定语从句。

　 第二题选择that，是It was…that…的强调句。因为去掉这个结构，所保留的是个完整语句，即：Mark Twain spent much of his childhood along the Mississippi River，只不过使用强调结构来突出地点"along the Mississippi River”。但是，你如果还是以强调句的惯性思维来回答第三至第五题，你不免就犯了“经验主义”的错误，因为这三个，如果是强调句的话，在去掉强调结构后，都不是正确的、或不符合上下文语境的句子：即

4. -- Where did you get to know her?

　 --It was on the farm ______ we worked.

　　 A. that　　　 B. where　　　　 C. which　　　 D. there

3. It was evening ______ we reached the little town of Winchester.

　　 A. that　　　 B. until　　 C. since　　　 D. before

2. It was along the Mississippi River ____ Mark Twain spent much of his childhood.

　　 A. how　　　 B. which　　 C. that　　　　 D. where

1. Harry Potter is such an interesting book _____ everybody likes to read.

　　 A. that　　　　 B. as　　 C. which　　　 D. /

3. 高度警惕的几个陷阱

　　 你不妨先试着回答下面几个题目：

2. Nobody believed his reason for being absent from the class _______he had to meet his uncle at the air port.

　 A. why　　　 B that　C. where　　 　D. because

答案：BB。第一个句子是定语从句，that代替先行词reason，在从句中作宾语(he explained the reason)；第二个句子是名词从句，that引导的从句做reason的同位语，是进一步说明reason的内容，that只起连接从句的作用，在从句中不担当任何成分。

1. Nobody believed the reason _______he explained for being absent from the class.

　 A. why　　 B that　　　 C. as　　　 D. because

2. 定语从句的that和名词从句的that

　 定语从句的关系代词that在从句中有语法作用(做主语、宾语等)，而名词从句中的从属连词that只是起连接名词从句的作用，本身没有词义，没有语法作用。因此，区别that到底是引导定语从句还是名词从句，只要看其有没有语法作用即可。例如下面两个题目：

3. In my opinion, life in the twenty-first century is much easier than ________.

　 A. that used to be　　 B. it is used to　　 C. it was used to　　　 D. it used to be

答案：DAD。

that，one和it的区别是：它们均代表前面说过的名词，但that代指单数不可数名词或概念，同类但并非同一个；one代指单数可数名词，同名异物；it代指同名同物。