Question

【题目】 —How long have you been away from your hometown?

— It has been twenty years ________ I went to college and work in Beijing.

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

Answer 1

【答案】C

【解析】

试题分析：句意：你离开你的家乡有多久了？——自从我上大学以来，在北京工作已经二十年了。A. unless除非；B. though尽管；C. since自…以来；D. until直到。since+句子，表示一段时间。结合句意可知，答案为C。