英语选择题，到底什么时候用in which 什么时候用from which

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英语选择题，到底什么时候用in which 什么时候用from which
we have received your letter of September 12, __ which we are glad to know that you are interested in our electric heaters 答案是选 from
thank you for your letter of june 16th, __which we note with pleasure that you intend to develop business with us in the table cloths.答案却是选 in
到底什么时候用in which什么时候用from which？

介词加which构成的定语从句的结构，介词的选择取决于从句的需要。第一个句子的定语从句应该是know sth from the letter;而第二个则是note sth in the letter。

in which 什么时候用定语从句中什么时候用in which什么时候用which. 定语从句中,什么时候用which什么时候用of which什么时候用in which啊宾语从句里到底什么时候用what什么时候用which 英语定语从句中什么时候要用in which? 定语从句中用which 可用介词+which 代替!但什么时候用in which 什么时候用at which 等介词+w 英语句子中什么时候用that、who、whom、whose、which、when、in which等英语定语从句什么时候用where which 另外 in which 有什么用法英语定语后置什么时候用where,which, 一个英文从句逗号后面什么时候用which什么时候用in which呢 the way引导定语从句什么时候用which什么时候用in which 在定语从句中什么时候用in which