题目内容
When asked what they would volunteer to do, ________ said they were willing to do something they could.
| A．half of these | B．half of which |
| C．half of whom | D．half of them |
D
试题分析：本题考查状语从句与定语从句的区别。由题干可知，题中when作为连词，引导时间状语从句，故逗号后缺少主句的“主语”，由此排除选项B和C。依据句意：当被问及他们自愿做什么,一半的人说他们愿意尽其所能。则选项D符合题意。
点评：和常考的定语从句不一样，这道题考查的是状语从句，若没有连词when，则考查定语从句的引导词，可选择选项C。（依据句意判断，先行词指“人”，且作介词of的宾语，故用whom。）
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