1、___well enough before the final exam,he failed to finish a

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1、___well enough before the final exam,he failed to finish answering all the questions in time.
填not having prepared 为什么
2、___when he started the research,he never gave up trying new ways to increase the production.填old as he was 为什么

1not having prepared well enough before the final exam,he failed to finish answering all the questions in time.这句话中not having prepared well enough before the final exam是分词做表原因的状语,他没能及时答完所有问题是过去的事,所以原因状语网前推一个时态,用过去完成时.
2old as he was也是表原因的状语,但是是从句,从句中old作为表语提前了,为了强调.

he failed ----- the final exam A.to pass B passing A:Tom failed the final exam.B:I don't think he could pass it The day before the final exam I even （）myself to a movie.用tr We should_____every minute before having the final exam.A ma He is ( )enough to pass the exam. Friday failed we before work finish the to 连词成句快 He was not the only one to A:fail the exam B to have failed 选择并解释 __is strange that he failed the final exam. He is too___(care) to pass the final exam To my s__,he could pass the final exam Harry,who had failed in the final exam,had a great worry ___ Harry,who had failed in the final exam,had a great worry____