Lisa, now stop for a short break. You should know that you all the morning.
| A．are working | B．had been working | C．have been working | D．have worked |
49. Some evidence threw doubt on ______ he had lent the money to the defender.
| A．if | B．which | C．that | D．Whether |
48. She took her son, ran out of the house, and ______ him in the car, drove quickly to the nearest doctor’s office.
| A．put | B．to put | C．putting | D．having put |
47. China’s winning the host of the Olympic was an exciting moment, ______ all Chinese will never forget.
| A．that | B．it | C．one | D．What |
46. He hesitated about the brake, otherwise the accident ______.
| A．could have been avoided | B．could have avoided |
| C．would have avoid | D．should have been avoided |
45. The population of China ______ to many times what it was in 1949, and most of its population ______ farmers.
| A．have grown; are | B．has grown; are | C．has grown; is | D．have grown; is |