students mustn't----(stand)on the chair in the classroom
问题描述:
students mustn't----(stand)on the chair in the classroom
答
stand
mustn't为情态动词,后加动词原形。本句mustn't表示【禁止,不允许】为口气较强的命令。
答
stand.must等情态动词后动词用原形.