The bad weather meant__________ the rocket launch(发射)for 48 hours,．
| A．delaying | B．having delayed |
| C．to delay | D．to have delayed |
He works in a factory now, but he__ on a farm for 20 years.
| A．worked | B．has worked | C．had worked | D．had been working |
They dug _____,then put the box in it.
| A．a three feet deep hole | B．a hole of three feet |
| C．a three feet deep hole | D．a hole of three feet deep |
Glad to see you back. How long __ in Russia?
| A．did you stay | B．have you stayed | C．were you staying | D．have you been staying |
They lived a ____ life in the countryside.
| A．quiet | B．still | C．silent | D．calm |
---Have you decided already?
---Yes, I __ at once.
| A．have decided | B．decided | C．will decide | D．had decided |