B: I have been to Beijing.
B：我去过北京。
Staff have been retrained to use the new technology.
为使员工学会运用新技术，对他们进行了再培训。
Several computer engineers have been contracted to the finance department.
有几位计算机工程师与财务部门签订了合同。
I must have been insane to agree to the idea.
我肯定是犯傻了，居然同意了这个想法。
Six theatre companies have been selected to take part in this year's festival.
已选定六个剧团参加今年的戏剧节。