By the time I back they up ten metres. A. came-have climbed B. came-had climbed C. come-have climbed D. had come-climbed 【查看更多】

 

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By the time I ________ back they ________ up ten metres.

[  ]

A.came, have climbed

B.came, had climbed

C.come, have climbed

D.had come, climbed

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