题目内容
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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