Everyone must dress up.If you ____,you can't go in

问题描述:

Everyone must dress up.If you ____,you can't go in
1.don't
2.won't
3.can't
4.mustn't

应该选don't因为前半句说大家都必须作这件事--打扮好,don't就是'不作',你就不能去.而won't是你不愿意作.跟don't比显然don't更准确.