about this computer program, a huge amount of time and energy .
| A．Should I know; be saved |
| B．If I had known; can be saved |
| C．Had I known; would have been saved |
| D．Did I know; was saved |
34. Is this the reason ______ at the meeting for his carelessness in his work?
| A．why he explained | B．he explained |
| C．what he explained | D．how he explained |
33. Great honors will be given to ______ have successfully rescued the victims of the earthquake.
| A．those who | B．whoever |
| C．who | D．Whom |
32. The traffic problems we were looking forward to seeing ______ should have attracted the government’s attention.
| A．solving | B．solve |
| C．to solve | D．Solved |
31. The decision ______ Internet addiction（成瘾）as a mental disorder has caused much debate.
| A．to classify | B．classifying |
| C．being classified | D．to be classified |
30. As we watched the panda, we stood still, ______ to one another.
| A．dared hardly to whisper | B．hardly daring to whisper |
| C．dared not to whisper | D．not dared whisper |