—The window is dirty.
—I know. It ______ for weeks.
| A．hasn’t cleaned | B．didn’t clean |
| C．wasn’t cleaned | D．hasn’t been cleaned |
After the flood, no house in the village ______,
| A．left standing | B．was left to stand | C．was remained standing | D．remained standing |
-----Hi, Nancy, I didn’t know you had come back. So have you graduated from college?
---- Yes. I _____ French for 5 years in Nanjing.
| A．have studied | B．studied | C．had studied | D．am studying |
---- Could I have a word with you?
---- Sorry, I am busy ______. Shall we do it later?
| A．at the moment | B．for a moment | C．on the moment | D．in a moment |
---Why didn’t you go to yesterday’s meeting?
---I would have but I ______ too busy working on the important experiment.
| A．had been | B．was | C．were | D．am |
According to the rules, students must not ____ their books during examinations.
| A．read | B．watch | C．notice | D．look at |