We plan to reach the North Pole in mid-July, and by then we _______ for six weeks.
A.are walking | B.have been walking |
C.will be walking | D.will have been walking |
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We plan to reach the North Pole in mid-July, and by then we _______ for six weeks.
A.are walking | B.have been walking |
C.will be walking | D.will have been walking |