单选题A light used to signal passing intentions must be an（）.Aalternating red and yellow lightBalternating white and yellow lightCall-round white or yellow lightDall-round white light only
单选题
A light used to signal passing intentions must be an（）.
A
alternating red and yellow light
B
alternating white and yellow light
C
all-round white or yellow light
D
all-round white light only
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