The workers, ________ had worked the whole day long, were worn out.
| A．all of what | B．all of which |
| C．all of them | D．all of whom |
. The reason for all the changes being made _______to us yet.
| A．has not explained | B．has not been explained |
| C．did not explained | D．were not explained |
24. You ought to have put the milk in the refrigerator, and now ________sour.
| A．it smell | B．it is smelt | C．it smells | D．it is smelling |
Tim ________since he lost his job three weeks ago.
| A．had been unemployed | B．was unemployed |
| C．has been unemployed | D．has unemployed |
– “Have you moved into the new flat?”
“Not yet. The room ________.”
has been painted B. is painted C. paints D. is being painted
It is said that a new robot ______ by him in a few days.
| A．designed | B．has been designed |
| C．will be designed | D．will have been designed |