成都到西双版纳路线:We mustn't sleep ____ class.

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填介词

in

We mustn't sleep in class．

We mustn\'t sleep in class.
in class表示在课堂上.

We mustn't sleep ____ class. We mustn't teel lies,______?(反意疑问) That is w___ we mustn't waste time. 关于mustn't I mustn't be+人名对不对 can't be和mustn'be的区别 can't be和mustn'be的区别 can't be和mustn'be的区别 You mustn't lend it to others. She mustn't see the film,must she?