在金融期货交易中,买卖双方成交时所交纳的保证金称作维持保证金.
参考答案：错
---Will you stay at home until your sister comes back?
---Sorry, I _______. I have a meeting and have to go in ten minutes.
A．can’t
B．won’t
C．mustn’t
D．needn’t
教师道德范畴
