Question

【题目】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

Answer 1

【答案】D

【解析】该句中的先行词是the children，此处先行词在定语从句中作主语，同时表示“人”，应该用关系代词whom，据此我们这里选D项。