题目内容
用have been, have gone的适当形式填空
Mr. Black isn't in the office, he ________ to the library.
My father ________ to Beijing to have a meeting. He ________ there twice.
John ________ back to his country and won' t be back until next week.
Where ________ you ________ ? I ________ to the barber's to have a haircut.