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The only existing problem is ____ we can find this special wood in the forest in such a short time.

A.when B.where C.that D.whether

D

解析试题分析:考查名词性从句。表语从句中是一般疑问句,句用关系词whether引导。句意:唯一存在的问题是,在这么短的时间内我们是否能够在森林里找到这种特殊的木材。根据句意说明D正确。
考点:考查名词性从句

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