单选题
1.[2009.10]The traffic was held up for more than thirty minutes， ______ caused me to arrive late.
A.it
B.that
C.what
D.which
正确答案： D
答案解析： [译文]交通阻塞30多分钟，这使得我到达晚了。
[试题分析]语法题。
[详细解答]非限制性定语从句引导词的选取。