【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】 考查連詞辨析When, 在…時， 既然。since自從，，因為， 既然; 自從…以來；as 由于，同時，當(dāng)…時,盡管；

before在…之前，要多久才…。分析句意可知， 自駕汽車達到大批量生產(chǎn)階段還有很長的路要走，而before，可譯為“在…之前，要多久才…”，符合題意，故選D。

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