Question

【题目】It is so cold that you can’t go outside _____ fully covered in thick clothes.

A. if B. unless C. once D. when

Answer 1

【答案】B

【解析】句意：外面太冷了，你不要出去，除非用厚衣服完全裹起来。unless fully covered为＂连词+省 略结构＂，补充完整为unless you are。故选B。