20. His sister left home in 1998, and______since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
When the lawyer asks you questions about the case，you should be________.
| A．on duty |
| B．on guard |
| C．on purpose |
| D．on watch |
“Neal，listen，”she said，looking straight at him.“I ask you not to get________in this kind of matter.It's none of your business.”
| A．caught |
| B．involved |
| C．attached |
| D．connected |
It is obvious that the hopes，goals，fears and desires________widely between men and women，between the rich and the poor.
| A．alter |
| B．shift |
| C．transfer |
| D．vary |
(2012年北京海淀区高三期末)When________if she would request a rise，the actress noted that money was not important.
| A．asked |
| B．being asked |
| C．having asked |
| D．asking |
(2012年重庆联合诊断性考试)It is rather difficult to make friends with him，but his friendship，________，is more true than any other's.
| A．once gained |
| B．when to gain |
| C．after gaining |
| D．while gaining |