The coal miners    in the coal mine for 10 hours before we came to their rescue.

A．had trapped

B．had been trapping

C．had been trapped

D．would have been trapped

材料消耗预算定额，主要用于编制施工图预算，如果企业用于编制材料计划，供内部施工生产使用，则可根据实际需要调整。