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【题目】Walkers have to finish ________ the 100-km trail ________ 48 hours.

A. to walk; for B. walking; within

C. walking; for D. to walk; within

【答案】B

【解析】

句意:步行者必须在48小时内完成100公里的步行。finish doing sth.做完某事。首先排除A,Dwithin在…的范围内;for (表时间、距离、数量等)达,计。finish是短暂性动词,不能与表示一段的时间状语连用,for 48 hours不符合题意,故正确答案为B

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