-( )in the exam,he realized that he would have to study hard

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-( )in the exam,he realized that he would have to study harder.
A.To be failed B.being failed C.Having failed D.failing
fail in是不是要用被动？

having failed 不要用被动啊.为什么要用被动呢.用主动还是被动,是看这个动词和主语的关系.这里的动词是fail.主语是he..他是主动的去做失败这个动作（即使不是他想这么作）,而不是他被动的被弄失败啊
这里选C.是因为他先失败了,再意识到该好好学习了.发生在先的动作,用完成时态

-( )in the exam,he realized that he would have to study hard Has he realized that he must study hard?yes,he studies harde he studied hard ONLY to fail in the exam 意思? （）,he would have passed the exam.A.If he studied hard B.Had he should study hard to pass the exam（对划线部分提问）划线部分study hard —,he would have passed the exam. didn't study hard.He is _____ failing the exam. He studies so hard that he is c___ to pass the exam study hard.you are sure to have a good result in the exam A. Study hard,_you're sure to have a good result in the exam. Study hard,andyou re sure to have a good resvlt in the exam. Study hard,( )you aer suer to have a good result in the exam