【題目】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: 自駕汽車(chē)達(dá)到大批量生產(chǎn)階段還有很長(zhǎng)的路要走,when, "在.....時(shí), 既然";since"自從,因?yàn)椋?既然,自從.....以來(lái)”;as “由于,同時(shí),當(dāng)......時(shí),盡管”;before“在......之前,要多久才......”。故選D。

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