As a UN report warns, animals at a speed 100 times faster now than any time in the past ——青夏教育精英家教网—

摘要： As a UN report warns, animals at a speed 100 times faster now than any time in the past since the dinosaurs were wiped out. A. are dying out B. have died out C. were dying out D. had died out

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As a UN report warns, animals ________ at a speed 100 times faster now than any time in the past since the dinosaurs were wiped out．