The scientist ________ a new bacteria in 1912.
A: discovered
B: was discovering
C: discovers
D: have discovered
A: discovered
B: was discovering
C: discovers
D: have discovered
A
举一反三
- The scientist ( )a new bacteria in 1912. A: discovered B: was discovering C: discovers
- 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
- Madame Curie is believed ____ the radium. A: discovering B: having<br/>discovered C: to have discovered D: to discovered
- The Vikings are believed ________America. A: to have discovered B: to discove C: in discovering D: to have been discovered
- Madam Curie is believed ___ the radium. A: having discovered B: to discover C: to have discovered D: discovering
内容
- 0
Madame Curie is believed _________ radium (镭). A: discovering B: having discovered C: to have discovered D: to discover
- 1
It ______ long ago that the earth is round. A: was discovered B: is discovered C: discovers D: discovered
- 2
DNA is very useful for us, it many years ago. (1.0) A: discovers B: discovered C: is discovered D: was discovered
- 3
He became very friendly when he ____________ that she was my sister. A: was discovered B: discovers C: has discovered D: discovered
- 4
We’re looking forward to his new _______ . A: discover B: discovered C: discovery D: discovering