— How was your holiday?

— It couldn’t have been _____. I just stayed in the hotel because it was raining most of the time.[      ]

A. boring          

B. more boring    

C. most boring      

D. less boring

直接成本和间接成本的划分依据是（）。

A.成本依产量的变动性

B.产量依成本的变动性

C.成本的不可追溯性

D.成本的可追溯性