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

A. wouldn't                            

B. needn't

C. mustn't                            

D. daren't

对于会计账簿的更换，一些更换新账、重抄一遍的工作量较大的明细账，可以连续使用，不必每年更换。（　　）