问题补充:
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
答案:
A. are walking
B. have been walking
C. will be walking
(答案→)D. will have been walking
解析:句中by then短语表示一个将来的时间状语,所以谓语用将来完成时,因此选D。
如果觉得《We plan to reach the North Pole in mid-July and by then we for six weeks.A. are walkingB》对你有帮助,请点赞、收藏,并留下你的观点哦!