单选题 The Panama Canal was constructed in 1915 ______ three hundred fifty million dollars.

【正确答案】 B
【答案解析】[分析] at a cost of“耗资”,“以……的代价”;at half cost to“以半价”;at any cost和at all costs同义,意为“不惜任何代价”,“无论如何”。根据题意和事实,B是正确答案。