The scientist ( )a new bacteria in 1912.
A: discovered
B: was discovering
C: discovers
A: discovered
B: was discovering
C: discovers
举一反三
- The scientist ________ a new bacteria in 1912. A: discovered B: was discovering C: discovers D: have discovered
- We’re looking forward to his new _______ . A: discover B: discovered C: discovery D: discovering
- It ______ long ago that the earth is round. A: was discovered B: is discovered C: discovers D: discovered
- By the year 2010, scientists probably ______ an effective treatment for cancer. A: will have discovered B: are discovering C: will be discovering D: have discovered
- DNA is very useful for us, it many years ago. (1.0) A: discovers B: discovered C: is discovered D: was discovered