题目内容

A small car is big enough for a family of three ____ you need more space for baggage.
A.onceB.becauseC.ifD.unless
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.
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