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?

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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?

( How long does ) it often (take) to go from Beijing to Shanghai by train

How long does it often take to go from Beijing to Shanghai by train?