(2010·黑龙江哈九中高三上第二次月考) 25. --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
(2010·黑龙江哈九中高三上第二次月考) 25. --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
D