___ three times in a row, the boxer decided to make a fourth attempt, though．
| A．Having defeated | B．To have defeated |
| C．Having been defeated | D．To defeat |
_____ of water makes Death Valley a desert, but it is by no means devoid.
| A．Lacking | B．Being lack |
| C．Because of lack | D．Lack |
There are some police cars in front. What do you suppose _____?
| A．is the matter | B．is happened |
| C．is the wrong | D．the trouble is |
Tina _____ have known the truth, or she would have told us.
| A．mustn't | B．shouldn't | C．can't | D．needn't |
_____ their real economic situations, they got some relief fund from the government.
| A．Considering | B．Considered |
| C．Having been considered | D．Being considered |
No matter how frequently _____ the works of Beethoven always attract a large number of
people.
| A．performing | B．performed |
| C．to be performed | D．being performed |