29．—The cleaning must have taken you quite a long time yesterday．
—Right．The rooms ______ for two months．
| A．haven't been cleaned | B．didn't clean |
| C．hadn't been cleaned | D．hadn't cleaned |
By next summer John _____in this factory for thirteen years.
| A．has been working | B．will have been working |
| C．will be working | D．has worked |
Tom sat under a tree and seeing his friend, _____ up in no time.
| A．to stand | B．standing | C．stood | D．would stand |
—When will you come to see me, Dad?
—I will go to see you when you_____ the training course.
| A．will have finished | B．will be finishing | C．are finishing | D．finish |
I’m afraid I won’t be available then. I _____ a friend off at 3:00 this afternoon.
| A．see | B．am seeing | C．will see | D．will be seeing |
While our manager is away on business, our company will be _______Mr Zhang.
| A．in the charge of | B．in charge of | C．taken charge of | D．taking the charge of |