Question

【题目】______it is often cold in the mountains, you need to wear warm clothes.

A. Though B. Unless C. As D. Until

Answer 1

【答案】C

【解析】句意：由于在山里常常很冷，你需要穿暖和的衣服。A. Though虽然；B. Unless除非；C. As由于；D. Until直到…时。根据题干______it is often cold in the mountains, you need to wear warm clothes.可知此处用as来引导原因状语从句，即“由于在山里常常很冷，你需要穿暖和的衣服”，故选C。