The human beings have polluted the environ
题型:单项选择题
问题:
The human beings have polluted the environment seriously. It is time the United Nations must take some measures.
A.take
B.taking
C.to take
D.took
The human beings have polluted the environment seriously. It is time the United Nations must take some measures.
A.take
B.taking
C.to take
D.took