问题补充:
—When did you finish your homework last night?
—A bit late, my father came back home from work.
A. though
B. unless
C. if
D. until
答案:
A. though
B. unless
C. if
(答案→)D. until
解析:though虽然,尽管;unless除非,如果不;if是否,如果;until直到。句意:昨晚你什么时候完成的你的作业?——有点晚了,一直到我父亲下班回家。结合语境可知选D。