be quick和be quickly的区别是什么啊?

有没有be quick这个用法?

He was _______the teacher's questions.
A.quickly to undersand B.quick to understand
C.quickly understood D.quick understanding

Be quickly和Be quick be quick和be quickly的区别是什么啊? 一个问题!!!!!!!!!!!Be quick! 快进来!!!!!!!!!!!!Be quick! 来来来啊~~~~ BE QUICK~! 翻译:do you know the traffic rules?和be quick.there are no people here. be away和be off? Be和be的区别 be taken和be caught should be 和should be区别