He became very friendly when he ____________ that she was my sister.
A: was discovered
B: discovers
C: has discovered
D: discovered
A: was discovered
B: discovers
C: has discovered
D: discovered
举一反三
- DNA is very useful for us, it many years ago. (1.0) A: discovers B: discovered C: is discovered D: was discovered
- It ______ long ago that the earth is round. A: was discovered B: is discovered C: discovers D: discovered
- The scientist ________ a new bacteria in 1912. A: discovered B: was discovering C: discovers D: have discovered
- Within days he became paralyzed, and people feared that he might die. But he _________. A: absorbed B: dissolved C: discovered D: recovered
- “How was ______ they discovered the entrance to the underground palace?”“Totally by chance.” A: it that B: he that C: it when D: he which