________ twice, the postman refused to deliver our letters unless we chained our dog. (2009北京卷)
| A．Being bitten | B．Bitten | C．Having bitten | D．To be bitten |
33. Reading aloud in the morning is _____ to learning a foreign language.
| A．benefit | B．used | C．beneficial | D．Habit |
32. John was made____ the truck for a week as a punishment.
| A．to wash | B．washing | C．wash | D．to be washing |
31. Last week, only two people came to look at the house, ____ wanted to buy it.
| A．none of them | B．both of them | C．none of whom | D．neither of whom |
30. She urges me ____ steps in the matter.
| A．take | B．taking | C．took | D．to take |
29. It is during the Second World War ____he died.
| A．when | B．after | C．before | D．That |