题目内容
11．The letter I received from my on-line friend yesterday is very important．（ ）| A． | who | B． | where | C． | what | D． | that |
分析 我昨天收到的那封在线朋友的信是很重要的．
解答 答案：D．who意思是"谁"先行词是表示人的名词或代词；where意思是"在哪里"先行词是表示地点的名词；what不能引导定语从句；that意思是"那"引导定语从句时，先行词可以是指人的也可以是指物的名词，并在定语从句中作主语或宾语．根据"The letter I received from my on-line friend yesterday"先行词是letter，并且引导词在定语从句中作宾语，所以要用that来引导定语从句，故选D．
点评 首先要掌握这几个关系代词的意思以及用法，然后结合具体的题目，就可以确定正确答案．
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