There are twelve months----a year and there are usually thirty da_英语解答

There are twelve months----a year and there are usually thirty days------a month需要理由

人气：264 ℃　时间：2020-06-06 03:32:29

解答

There are twelve months (in) a year and there are usually thirty days (in) a month.
一年中有12个月,并且通常一个月里有30天.
一段时间内,就要用介词 in