----Why does the lake smell terrible? --
题型:选择题
问题:
----Why does the lake 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 lake smell terrible?
----Because large quantities of water_______? [ ]
A. have polluted
B. is being polluted
C. has been polluted
D. have been polluted