The doctors are at a loss because so far no medicine has been found to _____ the spread of the disease.
举一反三
- 中国大学MOOC: Not a _____ has been found so far that can help the police find the criminal.
- It has been found that the placebo is effective in every disease.
- Doctors are．________ (worry) about the possible spread of the disease．
- Not a ____ has been found so far that can help the police find the thief. A: sight B: clue C: fact D: sign
- When did Mongolian doctors begin to spread the knowledge of Mongolian medicine?