单选题During the day，a dredge will indicate the side on which it is safe to pass by displaying（）.Atwo balls in a vertical lineBtwo diamonds in a vertical lineCa single black ballDno shape is shown during the day
单选题
During the day，a dredge will indicate the side on which it is safe to pass by displaying（）.
A
two balls in a vertical line
B
two diamonds in a vertical line
C
a single black ball
D
no shape is shown during the day
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