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问题: 一道单项填空

He visited three cities when he stayed in the U.S.,----New York,Washington and Houston.
A.such as B.they are C.which is D.that is

解答:

1、选项A.such as :例如,是对前边所提的名词的举例说明,是部分的列举而不是全部,所以题目全部说出了这三个城市,所以不能用such as
2、如果用B.they are 的话,这就变成了两个分句中间需要连词and连接,因为没有连词,所以排除选项B.
3、用which 引导定语从句也可以,但是如果用which则是用来限定three cities,那么谓语动词应该用are,而选项用了which is ,所以排除
4、选项that is: 即,就是;是对前边内容的详细解释,即是对three cities地解释:NEWYORK, WASHINGTON,HOUSTON
所以答案选D.that is