问题
选择题
-- Are these _______ all from No. 2 Middle School?
-- Yes. They often _________ their free time to help the old here.
A．volunteers; volunteers
B．volunteer; volunteers
C．volunteers; volunteer
D．volunteer; volunteer
答案
答案：C
题目分析：句意：这些志愿者都来自第二中学吗？是的。他们经常志愿把他们的空闲时间花在帮助这里的老人。前一空上的词是名词，后一空上的词是动词。所以选C。