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
D
题目分析：句意：孩子们都玩了一整天都筋疲力尽了。句中没有连词，逗号隔开的是一个非限制性定语从句，修饰先行词 children故用关系代词whom.故选D。
考点：