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British adventurer and swimmer Lewis Gordon Pugh became the first person to swim in the icy waters of North Pole,to raise awareness of how global warming ______ the polar ice cap.
A.had affectedB.is affectingC.affectedD.will affect
B
因为全球变暖是现在人类面临的有待解决的客观问题。现在进行时态在句中表示渐进的意味。
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