下面有一般过去时和完成时态,选出完成时态,并填上has怎么区分啊?）1.shejustboiledanegg.2.sheboileditaminute3.sheneverbeentovhina,buthewastherein19924.healreadypaintedthatbookcase5.hepainteditaweekago

　　下面有一般过去时和完成时态,选出完成时态,并填上has怎么区分啊?）

　　1.shejustboiledanegg.

　　2.sheboileditaminute

　　3.sheneverbeentovhina,buthewastherein1992

　　4.healreadypaintedthatbookcase

　　5.hepainteditaweekago

　　6.sheemptiedthebasketthismorning

　　7.hejustdustedthecupboard