1）____ you study harder,you'll never pass the final exam

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1）____ you study harder,you'll never pass the final exam
A.If B.until C.unless D.except（解释每个选项为什么不行.）
2）The Indians used to live in____ is now part of the USA.A.where B.which C.what C.that
（前面有介词in我选which,答案是what,解释为什么不用which用what?）
3）His house is_____a stone's throw_____the school.
A.with;for B.within;of C.for;from D.within;to(为什么选B?这几个都选项有什么意思）
请用好理解的方法描述,
第二题是因为从句中缺了主语所以用what不用which,是这个意思吗?

其他的我不说,我只想说第二题,这里what 相当于the place where,live in是在一起的,live in some place.不是什么in which.what 这里作宾语从句中的主语.

1）____ you study harder,you'll never pass the final exam [ ] you study harder,you will never pass the final exam a if study harder and you'll pass the f_____exam You will be able to pass the exam if you study harder. 高中英语（连词）1.You'll pass the exam __C__you study with a strong The harder you study,________you'll become. “study hard,ma son i'll buy you a car when you pass the exam You should pass the exam but you'll have to study hard同意句 Study hard,and you'll pass the English exam【改为同义句】 1.Study hard,and you'll pass the english exam.改为条件状语从句.2.It study hard,( )you'll pass the exam Aor B and Cbut will your father （）you if you （）pass the final exam?