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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

試題分析：考查名詞性從句。表語從句中是一般疑問句，句用關系詞whether引導。句意：唯一存在的問題是，在這么短的時間內我們是否能夠在森林里找到這種特殊的木材。根據句意說明D正確。
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