______by Columbus in 1492,the island, or at least the western part of it now known as Haiti, was the scene of some of the most advanced political developments in the western world_________the eighteenth century, whose success_________the labor of half a million slaves
| A．Discovered ; well in; rested on | B．Discovered; late; relying on |
| C．Discovering; well in; counting on | D．Discovering; lately ;depends on |
____ is our belief that improvements in health care will lead to a stronger, more prosperous economy.
| A．As | B．That | C．This | D．It |
Mark was a student at this university from 1999 to 2003, ____ , he studied very hard and was made Chairman of the Students' Union.
| A．during which time | B．for which time |
| C．during whose time | D．by that time |
He is a student at Oxford University, ____for a degree in computer science.
| A．studied | B．studying |
| C．to have studied | D．to be studying |
The Smiths went to the country for the weekend as they ______ to the office.
| A．needn’t have gone | B．mustn’t go |
| C．may not go | D．didn’t have to go |
She thought I was praising her child，_____，in fact，I was scolding him for his bad behaviors at school.
| A．what | B．while | C．so that | D．therefore |