问题
选择题
My brother’s bedroom is always a mess, and he can never find anything, _________ is very frustrating.
A．where
B．whom
C．when
D．which
答案
答案：D
题目分析：句意：我哥哥的卧室总是一团糟，他从来找不到东西，这真令人使人沮丧的。这里用which引导非限制性定语从句，指代前面的句子，which在定语从句中做主语，所以选D。