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

________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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本试题收录于： 大学英语三级B级题库大学英语三级分类
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