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题目内容双击单词支持查询和收藏哦～
Drug companies rarely pursue new pharmacotherapies for rare diseases because of the high failure rates and the cost of research, which make the companies'chances of recovering their investments_____________.
- A.tenable
- B.dubious
- C.invaluable
- D.sanguine
- E.expensive
B显示答案
以上解析由 考满分老师提供。
