I brush teeth twice a day.对twice提问

I brush my teeth twice a day对twice提问 I brush teeth twice a day.对twice提问 I brush my teeth twice every day 划 twice 提问 I brush my teeth twice a day T brush my teeth twice a day对twice a day 提问 I brush my teeth twice a day.(twice下划线)求划线提问 you should brush your teeth (twice) a day.提问 i usually brush my teeth twice a day —————— 对划线部分提问 Jim_____(brush)his teeth twice a day We should brush our teeth twice every day.对划线部分提问（twice ever You should brush your teeth twice a day.对brush your teeth i brush my teeth twice a day 为什么要用teeth而不是tooth