1、___well enough before the final exam,he failed to finish answering all the questions in time.
问题描述：
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
答
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...