【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…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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