There are 12 months a year.关于这个句子中介词in省略的原因.如果作为一个固定用法,能具体归纳总结下吗?要是是有联系的,能不能解释下这种联系...汗......

There are 12 months in a year ,对12提问. 连词成句：are,in,there,year,12,a,months(.) there are seven ( ) in a week. they are ( ) ( ) ( ) ( ) ( )( )( )( )and( ). there are 12 months in There are t months in a year There are months in a year There are ( ) months in a year.填空 There months are twelve哪里错了? there are there months in spring 是甚么意思 There are 12 months in a year .对12提问意思 How many months are there in a season?答句 HOW many months are there in a year?是什么意思? how many months are there in a year怎么回答 there are (twelve) months in a year.括号部分提问 How many months are there in a season?译成中文 how many months are there in a year? There are twelve months in a year变一变疑问句 there are twelve months in a year.翻译 There are twelve months in year.对twelve提问