单选题An oil tanker，except as provided for otherwise，might discharge certain amount at certain rate of oil or oily mixtures into sea when（）.Ashe is not within a special areaBshe is within a special areaCshe has just departured from a special areaDshe is about to enter a special area
单选题
An oil tanker，except as provided for otherwise，might discharge certain amount at certain rate of oil or oily mixtures into sea when（）.
A
she is not within a special area
B
she is within a special area
C
she has just departured from a special area
D
she is about to enter a special area
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