问题
选择题
The children, ______ had played the whole day long, were worn out.
A．all of what
B．all of which
C．all of them
D．all of whom
答案
答案：D
题目分析：考查定语从句，句意：所有的整天玩的孩子都精疲力竭了。all of whom修饰the children,即all of the children,指人的不能用which，因为介词of后加宾语，所以用whom，不用who，选D。