this factory______for twenty years A.has been open B.has bee

this factory has been open for twenty years.为什么是open 而不是open This school( )for forty years.A,open B,has opened C,has been The supermarket ___ since two years ago.A.was open B.has bee the shop__for 5years . A has opened B has open C has been op The book shop () for eight years.A.has been open B..has been He_____for twenty years.A.has joined B.has been in the army the factory has been open for twenty years 还是the factory has 要详解This factory ( )for twenty years.A.has opened B.has openC Mr .Zhang has been a teacher _________ twenty years.A for B. .The factory has been ________ for three years.A.to open B.o The factory has been ________ for three years.A.to open B.op The factory has been ------------- for two years.A.open B.to