B: I have been to Beijing.

　　B：我去過北京。

　　Staff have been retrained to use the new technology.

　　為使員工學會運用新技術，對他們進行了再培訓。

　　Several computer engineers have been contracted to the finance department.

　　有幾位計算機工程師與財務部門簽訂了合同。

　　I must have been insane to agree to the idea.

　　我肯定是犯傻了，居然同意了這個想法。

　　Six theatre companies have been selected to take part in this year's festival.

　　已選定六個劇團參加今年的戲劇節(jié)。