Question

【题目】You will be out of date______you keep on studying from time to time.

A.untilB.althoughC.orD.unless

Answer 1

【答案】D

【解析】

句意：除非你不断地学习,否则你会落伍的。

考查连词辨析。until直到； although尽管，虽然；or否则，要不然； unless除非，如果。根据“you keep on studying from time to time.”可知，这里是unless引导的条件状语从句。根据题意，故选D。