答案：C

题目分析：此处cost 花费；value价值；use 用途；matter事情。本句是make use of的被动语态形式。原句可改写为：we made very little use of the waste material in the past.将其变成被动形式为：very little use was made of the waste material in the past. 故选C。句意：这个工厂的领导告诉我们，在过去这种废料很少被利用。