—Have you worked here since you graduated?
—No, I ____________at a factory in Beijing for six years.
| A．would work | B．have worked | C．had worked | D．worked |
-He seems to be a good teacher .
- _____ . He has been a teacher for 20 years.
| A．So does he | B．So he does | C．So is he | D．So he is |
The earthquake damaged many houses and bridges; ______, it caused over 2,300 deaths.
| A．otherwise | B．besides | C． therefore | D．however |
While other scientists are keeping____eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in ____humans.
| A．a , / | B．an, / | C．the, an | D．an, the |
---John, there is ______ Mr. Wilson on the phone for you.
---I'm in ______ bath.
| A．a; the | B．the; a | C．a;不填 | D．the;不填 |
The teacher, with 6 girls and 8 boys of her class, _______ visiting a museum when the earthquake struck.
| A．was | B．were | C．had been | D．would be |