— They are said to have been familiar with each other.
— But they_________. They were introduced only hours ago.
| A．may not have been | B．couldn’t have been |
| C．mustn’t have been | D．needn’t have been |
I was so familiar with him that I recognized his voice __________ I picked up the phone.
| A．while |
| B．after |
| C．in case |
| D．the moment |
__________ in 1993, the EU, together with the US, is one of the two largest economies in the world.
| A．Having founded |
| B．Founded |
| C．Founding |
| D．Being founded |
Linda worked for the Minnesota Manufacturing and Mining Company,__________ as 3M.
| A．knowing |
| B．known |
| C．being known |
| D．to be known |
After many experiments, finally we __________ the material we wanted very much.
| A．success to get |
| B．success in getting |
| C．succeeded to get |
| D．succeeded in getting |
The water __________ the sand soon disappeared.
| A．that added |
| B．adding to |
| C．added to |
| D．added in |