Question

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

Answer 1

D

句意：如果你不需要更多存放行李的空间，一辆小汽车对一个三口之家便足够了。once一旦……；because因为……；if如果……；unless如果不……。