(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
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A. all of what
B. all of which
C. all of them
D. all of whom
解析：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。