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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】 考查连词辨析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…。分析句意可知， 自驾汽车达到大批量生产阶段还有很长的路要走，而before，可译为“在…之前，要多久才…”，符合题意，故选D。

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