___________ the 1500s ____________ the first European explored the coa-考呗网

单选题___________ the 1500s ____________ the first European explored the coast of Califomia．

1When required by their teacher to take notes in classes, some students only do so ____________

2According to the regulations, anyone caught littering in the public places ____________to a large fine of HK $1 500．

3The article gives us a summary of the situation in the first part and then discusses it___________

A．at issue
B．at length
C．at random
D．at large