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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
因為全球變暖是現在人類面臨的有待解決的客觀問題�，F在進行時態(tài)在句中表示漸進的意味。
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