题目内容：

off and on、for up to、during the period、over time造句
不要很复杂的,

优质解答

It rains off and on.
断断续续地下着雨.
They waited for something to turn up.
他们等待着发生什么情况.
The average PE during the period was 30.
而在这期间的平均本益比是30
Bad habits are developed over time.
坏的习惯随着时间慢慢滋生.

追问：

thank

追答：

不客气，要采纳哦