Most of the roads were covered with thick snow, made our journey more difficultA. oneB.

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A. one
B. it
(答案→)C. which
D. that
解析：句意：许多道路被厚厚的雪覆盖着，这使得我们的旅行更加的艰难。通过分析句子结构，可知横线之后是一个非限制性定语从句，且关系词指代前面整个主句的内容，故只能用which，选C。