At present, there are thousands of people ________around the clock to fight against the flood.
A: are working
B: worked
C: working
D: to work
A: are working
B: worked
C: working
D: to work
举一反三
- They ____ in a hospital. A: working B: is working C: work D: is worked
- Every Saturday, I _______ from 9 o’clock in the morning to 5 o’clock in the afternoon in the supermarket. A: work B: am working C: worked
- He () in a chemical factory these days. A: work B: working C: is working D: worked
- People<br/>appreciate ____wit him because he has a good sense of humor. A: to work B: to have worked C: working D: have working
- He ________________ (not work) in the factory last year. A: didn't work B: was not working C: not working D: didn't worked