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

試題分析：句意:多年來,它被視為一個嚴重的問題,一個從來沒有真正解決。one是a serious problem 的同位語，代指前面出現(xiàn)的單數(shù)名詞。Where在哪里，先行詞應(yīng)為地點名詞；it代指具體唯一的事物；因此排除B C兩項。which引導(dǎo)定語從句，與that重復(fù)，故排除。因此選A。
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