-----may i go now? -----no,you ( ) let the teacher know first.
问题描述:
-----may i go now? -----no,you ( ) let the teacher know first.
need,must,can,may 为什么选b
答
情态动词May开头的疑问句,如果是否定的话,需要用mustn‘t
这里的话,也用到了must做回答,是为了一一对应.