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