The research they had been devoted to to be of great value to the cancer patients.
A. is proved
B. proves
C. has proved
D. proved
The research they had been devoted to to be of great value to the cancer patients.A. is
答案:2 悬赏:60 手机版
解决时间 2021-12-30 15:49
- 提问者网友：一抹荒凉废墟
- 2021-12-29 19:57
最佳答案
- 五星知识达人网友：轻熟杀无赦
- 2021-12-29 20:22
A. is provedB. provesC. has proved(答案→)D. proved解析：考查时态。句意：他们一直从事的研究证明对治疗癌症病人有巨大价值。they had been devoted to为后置定语从句。结合语境可知本句描述的是过去发生的动作，故用过去时态。选D。
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- 1楼网友：有你哪都是故乡
- 2021-12-29 20:52
谢谢了
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