What if acid rain happens twice a week in one year?

What if acid rain happens twice a week in one year? 4.What comes once in a year,twice in a week and never in a d What comes once in a year,twice in a week and never in a day what comes once in a year,twice in a week,never in a day? 英语猜谜语what comes ones in a year twice in a week but never in What occurs twice in a leftime,but once in a year,twice in a acid rain 求what is acid rain What comes once a year,twice a week and never a day? what's happening once in a minute twice in a week and once i 一定要讲理由What if it ______next week?A.rain B.is raining C.will 英语 1.what if it () next week?A rain B rains C is raining D w what happens twice in every moment,once in every minute,and