It’s not easy for trailwalkers to finish walking a__ trail within 48 hours.

A. 100-kilometre B. 100-kilometres

C. 100 kilometres D. 100 kilometres’

A 【解析】試題分析：句意為：在48小時之內(nèi)走完100公里的軌道對軌道尋路員來說是不容易的。在英語中，數(shù)詞與名詞之間用連字符號連接，相當(dāng)于一個形容詞，因此沒有復(fù)數(shù)形式，直接修飾后面的名詞。結(jié)合選項(xiàng)可知應(yīng)選A。
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