【题目】It won’t be long ______ self-driving cars appear on the market.
A. until B. after
C. when D. before
在线课程【答案】D
【解析】
考查连词。句意：不久后无人驾驶汽车就会出现在市场上。本句为句型it is not long before不久后，故选D。
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