________his stay in Shanghai，he visited a lot of places of historical interest．A.WhileB.DuringC.AsD.When
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B解析分析：此处stay是名词，空格词应该用介词，表示“在……期间”的意思，只能用during．(延伸)本句可以改为While he was staying in Shanghai，或When he was staying in Shanghai，…while意思是“在……期间”，when意思是“当……时候”，后面跟从句。