【題目】It won’t be long ______ self-driving cars appear on the market.

A. until B. after

C. when D. before

【答案】D

【解析】

考查連詞。句意：不久后無(wú)人駕駛汽車就會(huì)出現(xiàn)在市場(chǎng)上。本句為句型it is not long before不久后，故選D。

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