单项选择题
In reference to accidental oil pollution，the most critical time during bunkering is when （）.
A.you first start to receive fuel
B.hoses are being blown down
C.final topping off is occurring
D.hoses are being disconnected
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A.involving／impeding
B.involved／to impede
C.involving／to impede
D.involved／impeding -
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A.beaten
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