As to the long-term effects of global warming some believe that the damage has been done, .A. otherwise we take steps to make up nowB. now that we take steps to make upC. whether we take steps to make 题目和参考答案——青夏教育精英家教网—

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As to the long-term effects of global warming some believe that the damage has been done, ___________________.

A. otherwise we take steps to make up now

B. now that we take steps to make up

C. whether we take steps to make up now or not

D. unless we take steps to make up now

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