had been是過(guò)去完成時(shí)結(jié)構(gòu)：had+動(dòng)詞過(guò)去分詞：表示兩個(gè)事件中一個(gè)發(fā)生在前,或者說(shuō)是表示較早的過(guò)去.
After they had entered the house,they went into the dining room.
他們進(jìn)到屋里后,走進(jìn)了飯廳.
have been是現(xiàn)在完成時(shí)結(jié)構(gòu)：have/has+動(dòng)詞過(guò)去分詞：?jiǎn)螖?shù)第三人稱用has,其余用have.表示在過(guò)去不確定的時(shí)間里發(fā)生的并與現(xiàn)在有著某種聯(lián)系的動(dòng)作；或者表示開始于過(guò)去并持續(xù)到現(xiàn)在的動(dòng)作.
I've just had a cup.我剛喝了一杯.此處had為動(dòng)詞have（喝）的過(guò)去分詞