题目

Events Long March exhibit The Shanghai History Museum is putting on an exhibition to mark the 60th anniversary of the Long March. On show are more than 220 photos and 40 items that explain with pictures how the communist Red Army drew back from its besieged (被围困的) bases in Jiangxi Province and fought its way to northern Shanxi province in the mid-1930s. Explanations are all in Chinese. The show will end on November 20. Time:             10:00 am—4:00 pm. Address:        1286 Hongqiao Road Admission:     8 yuan for Chinese/ 15 yuan for foreigners Thai e 根据要求改写句子。 He had been a miner, a soldier and a lorry driver before he volunteered to direct traffic．(对画线部分提问) ________　________　________ he ________ before he volunteered to direct traffic?