Question

【题目】There is no reason to keep your phone at hand during a meal____you have some important things .

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

Answer 1

【答案】D

【解析】句意：除非你有一些重要的事情，否则你没有理由在吃饭时把手机放在手边。A. until直到；B. if如果；C. when当…时候；D. unless除非，如果…不…。结合句意和语境可知选D。