用适当的介词填空 Nick always brushes his teeth ____going to bed

问题描述:

用适当的介词填空 Nick always brushes his teeth ____going to bed

答案:【 before】之前,
介词before后面动词要用ing形式.
【●速度回答,】
【亲!你的10分满意,我们团队的无限动力】