问题
选择题
Tony showed me his new cell phone, _______ was small but it could change colors in different weather.
A．the screen of whom
B．whom the screen of
C．which the screen of
D．the screen of which
答案
答案：D
从四个选项的设置不难看出是考察介词加关系代词引导的非限制性定语从句。再从先行词watch可看出是指物，可排除A和B。C项中关系代词应放在介词之后，如改为of which the screen或者whose screen也是可以的。