The silkworm is an insect worth_____.
A: to study
B: studying
C: to be studied
D: being studied
A: to study
B: studying
C: to be studied
D: being studied
举一反三
- Please don't turn on the TV when people are trying （） A: studying B: to have studied C: to study D: being studied
- By the end of this year, I _________ English for ten years. A: am studying B: study C: have studied D: studied
- It is my first time _______ abroad. A: study B: to study C: studied D: studying
- He Engineering A: studies B: study C: is studying D: studied
- I __________from three to five o’clock this afternoon. A: am studying B: studied C: study D: have studied