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This position is open to anyone, whether old or young, ______can read and write.
A、who
B、which
C、that
D、whom
【正确答案】：A
【题目解析】：此处由who引导限制性关系从句。Who在此句中引导的关系从句与先行词用逗号隔开，是因为插入了“whether old or young”。