Airbags will protect the driver in the event of a frontal impact. The underlined part means______.

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问题 Airbags will protect the driver in the event of a frontal impact. The underlined part means______.

选项 A、if a frontal impact can be prevented
B、if a frontal impact happens
C、before a frontal impact
D、during a frontal impact

答案B

解析 in the event of意思是“如果发生,万一”,表示一种假设,B“如果发生正面撞击”,为正确答案。A项虽然也表示假设,但prevent意思是“避免”,与划线部分假设情况相反。C“正面撞击发生之前”、D“正面撞击发生时”不表示假设。
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