in the days 还是on the days?1 The days on which black people in the country could not travel without a pass are gone forever.2 I will never forget the days in which we worked together.为什么第一个用on which 第二个用 in which

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in the days 还是on the days?1 The days on which black people in the country could not travel without a pass are gone forever.2 I will never forget the days in which we worked together.为什么第一个用on which 第二个用 in which
in the days 还是on the days?
1 The days on which black people in the country could not travel without a pass are gone forever.
2 I will never forget the days in which we worked together.
为什么第一个用on which 第二个用 in which

in the days 还是on the days?1 The days on which black people in the country could not travel without a pass are gone forever.2 I will never forget the days in which we worked together.为什么第一个用on which 第二个用 in which
on the days 表示特指,也就是说话人都知道的而第一句说的是在这个国家里黑人旅行需要通行证的日子已经过去了,是特指那些需要通行证的日子
in the days 指一段时间
和in the morning与 on the morning是一样的道理

具体某一天用on which
in which 可以是在某一段时间里

第一个on修饰的是时间，强调那些日子；第二个in指工作的地方，强调地点。

In the days following对吗?还是In the following days 1 on the last few day 还是in the last few day（s）还是on the last few days on cold days与in the days区别 in working days ,还是on working days in those days还是on those days in the days 还是on the days?1 The days on which black people in the country could not travel without a pass are gone forever.2 I will never forget the days in which we worked together.为什么第一个用on which 第二个用 in which in the old days in the old days in the town还是on in还是on the blackboard in还是on the newspaper in the photos 还是on? on cold days与in the day区别 On hot days we often (b ) in the river.填空 However,the two countries in it on different days l am in beijing for five days.on the fi for与in的区别 i will go to the park｛｝three days .选 in还是on如是i am going to the park ｛｝three days 选 in还是on on the shelf还是in the shelf?