It was only after he had read the papers Mr. Gross realized the task before him was extremely difficult to complete.
| A．when | B．that |
| C．which | D．What |
. Zhong Nanshan is a famous expert who has _____ to ____ the origin of SARS.
| A．devoted; studying | B．been devoted; studying |
| C．devoted; study | D．been devoted; study |
Do you know the girl _____ just now?
| A．to who I nodded | B．I nodded to |
| C．I nodded to her | D．that has been seen |
The mayor of Beijing says that all construction work for the Beijing Olympics___ now
| A．has been completed | B．has completed |
| C．will have been completed | D．will have completed |
None would have dreamed of there _____ such a beautiful place.
| A．being | B．be | C．to be | D．is |
—You seem to have had that car for years. ---Yes, I should sell it ____ it still runs.
| A．before | B．during | C．until | D．while |