对括号部分提问:It often takes(about 16 hours)to go from Beijingto Shanghai by train.()()()it often
问题描述：
对括号部分提问:It often takes(about 16 hours)to go from Beijingto Shanghai by train.()()()it often
()to go from Beijing to Shanghai by train?
答
( How long does ) it often (take) to go from Beijing to Shanghai by train