问题
选择题
A small car is big enough for a family of three ____ you need more space for baggage.
A．once
B．because
C．if
D．unless
答案
答案：D
题意是“如果你不需要更多的空间来放行李，那么一辆小车对一家三口来说就足够了。”unless引导条件状语从句，在此相当于if you don’t need more space for luggage.