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．a(chǎn)ffectedD．will affect
B
因?yàn)槿蜃兣乾F(xiàn)在人類面臨的有待解決的客觀問題�，F(xiàn)在進(jìn)行時(shí)態(tài)在句中表示漸進(jìn)的意味。
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