The twins ____ Canada for three weeks. A.has been to B.have

The twins ____ Canada for three weeks. A.has been to B.have The twins___Canada for three weeks.A.has been to B.have been .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 museum has been open to the public for about two weeks.a All except Kathy ____ to the field.A.have been going B.has g _____ of the twins has been to new york a both b nobody c ne I have been occupied for the last weeks to pay you a vist句子里 I have been occupied for the last weeks to pay you a vist My mother____college for over three year.A has been to B has they have been in nanjing since ______.A.three weeks B.three James ( ) for three years.A.has joined the army.B.has been i