We plan to reach the North Pole in mid-July, and by then we _______ for six weeks.
A．a(chǎn)re walkingB．have been walking
C．will be walkingD．will have been walking
D。
句中by then短語表示一個(gè)將來的時(shí)間狀語，所以謂語用將來完成時(shí)，因此選D。
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