Teacher is often ___ the classroom.onofup and downdown____ do you buy so much bread ____?why;forwhat;forwhy;towhat;to
问题描述：
Teacher is often ___ the classroom.
on
of
up and down
down
____ do you buy so much bread ____?
why;for
what;for
why;to
what;to
答
选up and down
来来往往
老师常常来往于教室。
选what;for
相当于 why
你买这么多面包干什么？
答
1.up and down
2.what for
答
up and down
what for
答
teacher is often up and down the classroom
老师经常在教室
what do you buy so much bread for
你买这么多面包干什么？