题目内容：
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
参考答案：
答案解析：
单选题：The children,________ had played the whole day long, were w
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- 题目类型：单选题
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B．all of which
C．all of them
D．all of whom