A:灯L1与灯L2并联,电压表测灯L1两端的电压
B:灯L1与灯L2并联,电压表测灯L2两端的电压
C:灯L1与灯L2串联,电压表测灯L1两端的电压
D:灯L1与灯L2串联,电压表测灯L2两端的电压
When the competition ____ (start), David was still making his way to school.