He might have been killed ______ the arrival of the police.

A．man has cut down too many trees
B．man is eager to profit from trees
C．man hasn't realizes the importance of trees to him
D．man hasn't found cut that he has lost all trees

A．if people don't stop cutting trees
B．unless a country has a plenty supply of trees
C．unless all people the importance of planting trees and the government has good system of control.
D．if man doesn't stop cutting trees carelessly