Some researchers believe that there is no doubt ____ a cure for AIDS will be found.
| A．whether | B．what | C．which | D．that |
Hardly _______ to sleep when _______ the door.
| A．had I gone；someone knocked at |
| B．I had gone；did someone knock at |
| C．had I gone；did someone knock at |
| D．did I go；someone knocked at |
Never before in China _______ for the unemployed.
| A．has done so much |
| B．has been done so much |
| C．so much has been done |
| D．has so much been done |
_______ was only then I reread his theory recentlyI began to appreciate their value.
| A．until | B．that |
| C．then | D．so |
—We have to stop talking here outside.Listen, _______!
—Hurry up, or well be late.
| A．there goes the bell |
| B．there does the bell go |
| C．there the bell goes |
| D．goes the bell there |
Between our school and the department store _______ a 12-storeyed building.
| A．have | B．stands |
| C．has | D．stand |