4.Is this the shirt ______ he often wears?

4.Is this the shirt ______ he often wears?
A.whom B.the one C.what D.that
5.Is this shirt _______ he often wears?
A.which B.the one C.what D.that
答：这是两道经典的定语从句对比题.为增加题目的巧妙性,两题句只有一字之差,有的甚至四个选项设计相同,我稍加改动如上.
要做对这两题,不仅要熟悉定语从句相关的知识,更要会句子分析,能断句,知道主系表句型.
这两个题句的巧妙之处在于用了一般疑问句.使得两个句子看上去只有一字之差.上一句有the,下一句没有.选项就不一样.如果将两个句子改成肯定句,题目就非常简单：
4.This is the shirt ______ he often wears.
A.whom B.the one C.what D.that
5.This shirt is _______ he often wears.
A.which B.the one C.whom D.that
很明显,上一题空需要填一个关系代词,可以是that,也可以是which,甚至可以不填.
第二题明显缺少一个表语（同时又是后面的这个定语从句的先行词）,为避免重复,用the one,后面的关系代词that省略了.
注：what引导名词性从句也可以.我临时改了.
网上应该有更好的对比题.我给你找一找.
Is this the museum _____ you visited the other day?
　　A.that　　 B.where 　　C.in which　　 D.the one
Is this museum _____ you visited the other day?
　　A.that　　 B.where 　　C.in which　　 D.the one