—Why does the river smell terrible? —Bec
题型:选择题
问题:
—Why does the river smell terrible?
—Because large quantities of water__________.
A.have polluted
B.is being polluted
C.has been polluted
D.have been polluted
—Why does the river smell terrible?
—Because large quantities of water__________.
A.have polluted
B.is being polluted
C.has been polluted
D.have been polluted