题目内容
Walkers have to finish ________ the 100-km trail ________ 48 hours.
A. to walk; for B. walking; within
C. walking; for D. to walk; within
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题目内容
Walkers have to finish ________ the 100-km trail ________ 48 hours.
A. to walk; for B. walking; within
C. walking; for D. to walk; within