________it comes to self-driving cars, safety is always the number-one concern.

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问题 ________it comes to self-driving cars, safety is always the number-one concern.

选项 A、While
B、When
C、As
D、Because

答案B

解析本题考查固定结构的用法。when it comes to sth．是固定结构，意思为“当说到／谈到……；当涉及……”，符合句意要求。由此确定本题答案为B)。

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大学英语三级B级

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