改错 It was thought that the trip could take up to 13days to complete it.

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改错 It was thought that the trip could take up to 13days to complete it.

改错 It was thought that the trip could take up to 13days to complete it.
改错 It was thought that the trip could take up to 13days to complete it.

改错 It was thought that the trip could take up to 13days to complete it.
去掉it,
it was thought that (to complete) the trip could take up to 13 days.