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：本题考查非限制性定语从句。整句话的意思是：交通阻塞30多分钟，这使得我到达晚了。