“I’m certainly more and more to the conclusion that Iraq has, ____ they maintained（断言）, destroyed almost all of _____ they had in the summer of 1991.” Blix said.
| A．which, what | B．as, which | C．as, that | D．as, what |
—Have you known Dr. Jackson for a long time?
—Yes，since she ________ the Chinese Society.
| A．has joined | B．joins |
| C．had joined | D．joined |
Progress ________ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
—Why don't you go home?
—Because a lot of work________yet.
| A．hasn't finished | B．hasn't been finished |
| C．has been finished | D．haven't finished |
I'll return the book to the library as soon as I________it.
| A．will finish | B．am going to finish |
| C．finished | D．have finished |
This is the best dinner that I________.
| A．enjoyed | B．have enjoyed |
| C．had enjoyed | D．enjoy |