when I arrived at his office,he___on the phone

when I arrived at his office,he___on the phone Hardly() i arrived at the office when the phone when i arrived at his office ,i()that he()out 关於英语的过去进行时说明一句例如:When I arrived at his office,he was talking I arrived ____ the office at seven thirty this morning. She was answering the phone when the manager arrived at the When he arrived at the office, he found all the workers ____ When I arrived at the meeting,the first speaker __ He arrived very lately at the office. When I arrived at the hospital,something strange was happene I arrived at the airport ________(after/while/when/before)) The time when I arrived was late at night.