问题补充:
The children, had played the whole day long, were worn out.
A. all of what
B. all of them
C. all of whom
D. all of which
答案:
A. all of what
B. all of them
(答案→)C. all of whom
D. all of which
解析:考查非限制性定语从句,句意:那些玩了一整天的孩子们,都已经累坏了。首先先行词是the children是指人的,排除AB,them不能引导从句,这里是不定代词all+介词+whom引导定语从句,选C。