In the past few years, sea ice ____ in t
题型:选择题
问题:
In the past few years, sea ice ____ in the Arctic as a result of global warming.
A.had melted
B.has been melting
C.melted
D.is melting
In the past few years, sea ice ____ in the Arctic as a result of global warming.
A.had melted
B.has been melting
C.melted
D.is melting