Question

He suddenly fell ill, ______ prevented him from attending his friend’s wedding.

A．why

B．what

C．that

D．which

Answer 1

D

试题分析：句意:他突然生病了，这阻止他不能参加朋友的婚礼。这是非限制性定语从句，that不能引导；what不能引导定语从句；why不能在定语从句中作主语，这里先行词是逗号前的句子，which在从句中做主语，故选D。
点评：本题难度适中。非限制性定语从句是高中的重要的语法项目，在句中所用的关系有限制，提醒考生牢记它们的用法及意义。
即学即练：—Alice told me you called yesterday.
—Yes, I had a problem with Jane, ______  I thought you could help me with, but you were not in.
A. who            B. whom           C. that           D. which
解析：D。考查定语从句。第二句句意为：是的，我与珍妮有点问题，我想你能帮我处理，但是你不在。which在定语从句中作with的宾语。