They for sixteen hours and still have a long way to go.A. had walkedB. have been walkingC

发布时间：2020-08-16 06:02:26

They      for sixteen hours and still have a long way to go.
A. had walked
B. have been walking
C. walked
D. had been walking

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A. had walked
(答案→)B. have been walking
C. walked
D. had been walking
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