When I was young, I was told that I _____ play with matches.[ ]

A. wouldn't                            

B. needn't

C. mustn't                            

D. daren't

对于时间要求特别紧迫的抢险救灾工程建设，其工程承包合同计价形式较适合采用（）。

A.总价合同

B.固定单价合同

C.变动单价合同

D.成本加酬金合同