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The recommended hand signal to a student who needs to cross is given:

a.Before checking mirrors
b.Only after you have verified traffic has stopped and it is safe
c.As soon as the door opens
d.While the bus is still rolling to the stop

解析

The crossing signal is given only after the driver has scanned mirrors, confirmed all traffic has stopped, and determined it is safe to cross. Giving the signal too early can send a child into moving traffic. The driver watches the student until they are safely across.

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