问题
选择题
Ted came for the weekend wearing only some shorts and a T-shirt, ____ is a stupid thing to do in such weather.
A．that
B．what
C．which
D．when
答案
C
题目分析：句意：Ted这个周末来只穿了短裤和体恤衫，在这样的天气这么做真是愚蠢的事情。这里是非限制性定语从句，用which引导定语从句，指代前面的句子，在定语从句中which做主语，所以选C。