题目内容

For years, it was viewed as a serious problem, ________ that has never been really solved.
A.oneB.whereC.itD.which
A

试题分析:句意:多年来,它被视为一个严重的问题,一个从来没有真正解决。one是a serious problem 的同位语,代指前面出现的单数名词。Where在哪里,先行词应为地点名词;it代指具体唯一的事物;因此排除B C两项。which引导定语从句,与that重复,故排除。因此选A
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