题目

阅读下面文言文，完成21-24题。（8分） 明末高邮①，有袁体庵者，神医也。有举子举于乡，喜极发狂，笑不止，求体庵诊之，惊曰：“疾不可为矣，不以旬数矣子宜急归迟恐不及也。若道过镇江，必更求何氏诊之。”遂以一书寄何。其人至镇江，而疾已愈，以书致何。何以书示其人，曰：“某公喜极而狂，喜则心窍开张而不可复合，非药石③之所能治也。故动以危苦之心，惧之以死，令其忧愁抑郁，则心窍闭，至镇江当已愈矣。”其人见之，北面再A new kind of drug ___ ___ to cure H7N9 bird flu by the scientists and they are hopeful that they will succeed in a couple of weeks. A. has been developed   B. is being developed    C. is developing    D. has developed