─This box is _____ heavy for me to carry. Can you help me?

─Certainly. [ ]

A. so

B. much

C. very

D. too

在合同执行过程中，由于通货膨胀而使工料成本增加，按合同规定对合同总价进行相应调整的合同形式称为( )合同。

A．纯单价

B．成本加酬金

C．不可调值总价

D．可调值总价