This is a process happens when land beco
题型:选择题
问题:
This is a process happens when land becomes desert people cut down trees and dig up grass.
A.when; because
B.that; because of
C.when; because of
D.which; because
This is a process happens when land becomes desert people cut down trees and dig up grass.
A.when; because
B.that; because of
C.when; because of
D.which; because