英语选择When asked what they would volunteer to do
问题描述：
英语选择When asked what they would volunteer to do
When asked what they would volunteer to do,（）said they were willing to do something they could.
A。half of whichB.half of whom
请解释一下
答
用half of whom ,whom做of的宾语,翻译为他们之中一半的人.