他已事先写好了答案。用英语怎么说？

他已事先写好了答案。

He had prepared scripted answers.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

prepared

adj. 事先准备好的，愿意的，期望的；adv. 事先准备好地，愿意地，期望地；v. 准备( prepare的过去式和过去分词)，预备（饭菜），配备，使（自己）有准备；

例句
The officers and crew prepared to abandon ship in an orderly fashion.
全体船员秩序井然地准备弃船。

scripted

v. 为电影（或戏剧等）写剧本( script的过去式和过去分词 )；

例句
...James Cameron, who scripted and directed both films.
詹姆斯·卡梅伦，这两部电影的编剧兼导演

answers

v. 答复( answer的第三人称单数 )，解答，答辩，适应；

例句
There are no easy answers to the problems facing the economy...
解决经济所面临的问题并非易事。