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 I can hardly imagine Peter ______across the Atlantic Ocean in five days.
A. sail     B. to sail     C. sailing     D. to have sailed

I can hardly imagine Peter ______across the Atlantic Ocean in five days.

A.sail  B. to sail C. sailing D. to have sailed

I can hardly imagine Peter ______ across the Atlantic Ocean in five days.

    A. sail               B. sailing           C. to sail      D. to have sailed