单项选择题
They look so much like each other that you can't tell which is（）
A．who B．whom C．which D．that
单项选择题 A friend of mine returned to his house after a holiday, only to find it（）
单项选择题 She had to do such things（）her will.
单项选择题 If you want to change to a double room you'll have to pay（）50 Yuan.
