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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(guān)系詞whether引導(dǎo)。句意:唯一存在的問題是,在這么短的時間內(nèi)我們是否能夠在森林里找到這種特殊的木材。根據(jù)句意說明D正確。
考點:考查名詞性從句

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