表示从过去某一时间开始,延续到过去另一时间的被动动作,该动作可能还要延续下去,常和for或since引导的表示一段时间的短语或从句连用。 The sale had been advertised for several weeks. 这场拍卖会已经做了好几个星期的广告。 Much work had been done since she arrived here. 自她抵达这里后做了许多工作。
2.