The woods are remains of a huge forest once covered the whole area.A. whereB. whichC. whos

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A. where
(答案→)B. which
C. whose
D. when
解析： 句意：这些树林是一个大森林的残余，它曾经覆盖了整个地区。这里使用了定语从句，先行词是forest，定语从句中缺少主语，所以用which引导定语从句，选B。