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WHEN THE WASTES ARE POURED INTO THE ATMOSPHERE, TH...
WHEN THE WASTES ARE POURED INTO THE ATMOSPHERE, THE AIR ...UNPLEA...
2000 CAU TRAC NGHIEM ANH A B C
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279. When the wastes are poured into the atmosphere, the air ...
unpleasant to breathe.
a. become
b. becomes
c. became
d. has become
--> b
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279.
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2000 CAU TRAC NGHIEM ANH A B C