10. is often the case, we have worked out the production plan.
| A．Which | B．When | C．What | D．As |
147. --- How long have you _____ friends?
--- Five years. I made friends with him when we studied together in Beijing Institute of Technology.
| A．made | B．been | C．had | D．Changed |
146. I _____ stiff after sitting so long, and could hardly walk.
| A．freeze | B．was frozen | C．was freezing | D．Froze. |
145. The nation was reunited and the slaves were ______ when the North won the Civil War in American history.
| A．escaped | B．set free | C．set freedom | D．set out |
144. The Romans __________ a great city on the banks of the River Seine in 1780s.
| A．found | B．find | C．founded | D．Finded |
143. You have done me great wrong. I’ll never __________ you for what you did.
| A．forget | B．forgive | C．excuse | D．Forcast |