Question

【题目】(2017·北京卷) If you don't understand something, you may research, study, and talk to other people ________ you figure it out.

A. because B. though C. until D. since

Answer 1

【答案】C

【解析】考查状语从句。 根据句意可知用until，表示＂直到＂。句意：如果你遇到不明白的东西，可以研究、学习、与人交流，直到你弄清楚。