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【题目】Self-driving vehicles still have a long way to go they can reach the mass production stage.
A.when
B.since
C.as
D.before

【答案】D
【解析】句意: 自驾汽车达到大批量生产阶段还有很长的路要走,when, "在.....时, 既然";since"自从,因为, 既然,自从.....以来”;as “由于,同时,当......时,尽管”;before“在......之前,要多久才......”。故选D。

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