We have to clean the house ( ) time to time.

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Wehavetocleanthehouse()timetotime.Wehavetocleanthehouse()timetotime.Wehavetocleanthehouse()timetotim

We have to clean the house ( ) time to time.
We have to clean the house ( ) time to time.

We have to clean the house ( ) time to time.
from
from time to time 是一个固定短语,不时;偶尔;间或 的意思
例:I go shopping from time to time.我时常去购物.
You are required to check back this page from time to time.你们必须时常来这个网页查看(公告啊之类的).

from
时常