在变道之前，哪项操作是可选的？

428. 在变道之前，哪项操作是可选的？

单选题正确率: 93%

A. 使用转向灯 B. 查看你的后视镜 C. 回头查看 D. 所有这些都是必须的

恭喜，答对了！ {{vm.result.explain}}

答案不正确！ {{vm.result.explain}}

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