常见汉译英短语对应 — 英语词汇题

汉译英选择填空：无论遇到多大的困难，研究人员都没有放弃这项实验，最终成功地开发出了一种新的药物。填空：However great the difficulties were, the researchers never ______ the experiment and eventually succeeded in developing a new medicine. A. gave up B. gave in C. put off D. turned down