Ozone depletion has been _______ at the poles, especially over Antarctica, where a seasonal ozone layer “hole’ appears.
A. as severe as
B. so severe as
C. more severe than
D. the most severe
Ozone depletion has been _______ at the poles, especially over Antarctica, where a seasonal ozone layer “hole’ appears.
A. as severe as
B. so severe as
C. more severe than
D. the most severe
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