Before the construction of the road, it was prohibitively expensive to transport any furs or fruits across the mountains.
【正确答案】
D
【答案解析】句中prohibitively的意思是“禁止地，过高地”。与它相接近的词是forbiddingly“禁止地，令人生畏地”。determinedly“断然地”；incredibly“不能相信地”；amazingly“令人惊讶地”都不符合句意。故选D。