工作了八小时了。By six o’clock they _______ (work)for eight hours.2. 我到广州时,他在那里很长时间了。When I came to GuangZho u, he _______(be) there for a long time.3.到上个月中旬我们在北京住了有五年时间了。By the middle of last month we ______( live) in Beijing for five years.4. 到昨晚上,他已写完那封信。By yesterday evening he _________ (write) that lette...