There are frequently reports of accidents as fireworks ______, stored or transported. 
#100331
A
have been made
B
are being made
C
were made
D
have made
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On the bus, all the people except the driver ______ to talk and laugh during the journey. 
#102607
A
encouraged
B
were encouraging
C
were encouraged
D
was encouraged
Yangzhou high school ___________ since 1902. 
#100008
A
has come into existence
B
has been existed
C
has been in existence
D
began to exist