问题
选择题
(2013·高考浙江卷)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
选D。题干的意思是：“孩子们玩了一整天，都累坏了。”分析句子结构可知，________had played the whole day long是非限制性定语从句，先行词children指人，故排除A、B、C三项。所以正确答案为D项。