We have finished the project finally . No one can imagine the difficulty we had _____the problem,
| A．to solve | B．solved | C．solving | D．solve |
Under the tree was a little girl sitting still,eyes___on the sky,listening to MP3 music
| A．fixed |
| B．fixing |
| C．are fixed |
| D．are fixing |
John received an invitation to dinner,and with his work___,he gladly accepted it
| A．finished |
| B．finishing |
| C．having finished |
| D．was finished |
Weather___,we’ll go out for a walk
| A．permitted |
| B．permitting |
| C．permits |
| D．for permitting |
The production___steadily,the factory needs an ever-increasing supply of raw material
| A．has gone up |
| B．is going up |
| C．having gone up |
| D．being gone up |
All flight___,we decided to take a train
| A．were canceled |
| B．had been canceled |
| C．having canceled |
| D．having been canceled |