________,or you will fail in the exam

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________,or you will fail in the exam
A.studying hard
B.to study hard
C.study hard
D.studied
为什么不选择A,不是独立结构吗

C
这是个常见的句型：
祈使句（动词原形开头,表条件） + and + 陈述句（一般用will + 动词原形）
Work hard ,and you'll catch up with him.
=If you work hard,you'll catch up with him
如果表否定,中间用or
Hurry up,or you 'll miss the train.
=If you don't hurry,you'll miss the train

________,or you will fail in the exam Study hard ,or you will fail in the exam or为什么不用and Please take it _____,or you will fail in the exam.(seriously Study hard ,or you will fail in the exam 改为同义句 STUDY hard,__ study hard ( )you will fail in the next exam if you don't be careful,you will fail in the exam.和if you ar Study hard,or you'll fail (in) the exam中的study为什么是动词原形 If you don't study hard,you will fail in the exam(同义句) You will fail in the English exam if you don`t study hard. If you don't be carefully ,you will fail in the exam.改为祈使句 15.—Do you think David will fail in the maths exam again?—__ You think that he will fail in the exam,____?反意疑问句是什么?