1 As a teacher,I never give students so difficult a question

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1 As a teacher,I never give students so difficult a question____they can't work out.
As a teacher,I never give students so difficult a question____they can't work it out.
请问这两句话有什么区别?为什么第一个空填as,第二个空填that?

1.作为老师,我从来不会给学生这么难的问题,因为他们答不出来
2.作为老师,我从来不会给学生们难到以至于答不出来的问题.
第一个 as 后面接原因从句,解释为什么我不给学生这么难的问题：因为他们做不出来.这个做不出来的问题,不特指前面的那个question,所以不用加it,因为是泛指这类问题.
第二个that后面接定语从句,用来修饰question,我不会给学生们这么难的问题,难到什么程度呢,难到大家都做不出来.这个it 特指前面的question.
希望能有所帮助
再问：请问第一句怎么看出是状语从句？as引导的定语从句与状语从句怎么区别？怎么看出第一句话they can't work out是原因？如果不知道答案怎么想出as?谢谢
再答：区别就在于it。 As 引导的原因状语从句，是用来解释前面整个句子的。 that 引导的定语从句一般只是用来修饰或者限定that 前面的那个单词。所以根据你给的2个句子，有it的那个句子，是针对question来限定修饰的，没有it的，是针对前面的句子来解释的。
再问：谢谢，那如果没有答案，怎么想出as来？用because,since可不可以
再答：如果没有选项，那就根据想要表达的意思来。 as 可以用because和since代替.

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