几个英语问题..1.you are sure ___ the exam if you study hard.A.pass

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几个英语问题..
1.you are sure ___ the exam if you study hard.
A.pass B.to pass C.passing D.passed
2.-____ Mary use to play the piano?
-No,she ___.
A.did,didn`t B.was,wasn`t C.did,wasn`t D.was,didn`t
3.there used to be a tall tree in front of our classroom,____?
A.used there B.didn`t there C.wasn`t it D.did it
说说原因,
补充一个问题：
那的确是酷热的一天。
it ____ was ____ _____day.
可是really是副词，应该在was后吧？

B
A
B
It reather was a hot day

几个英语问题..1.you are sure ___ the exam if you study hard.A.pass You are sure to pass the exam [ ] you study hard a if b thou You study () hard () you are sure to pass the exam .Thank yo if you study hard,___you will pass the exam. 单项选择8道题1.you will pass the exam _____ you study hard A.if B. study hard.you are sure to have a good result in the exam A. 英语1.If you parctise a lot,you're sure to pass the exam（同义句） If you work hard ,you will ______(sure) pass the exam If you don't study hard ,you won't pass the exam.同义句转换 you need____(study) hard if you want to pass the exam If you don't study hard , you will not pass the exam.拜托各位大神 If you don't study hard ,you will fail _____(pass) the exam.