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140. Studies showed that the accumulation of carbon dioxide ______ average global temperatures to rise nearly four degrees Fahrenheit by the twenty–first century.
(A) have caused
(B) has caused
(C) have been causing
(D) causing

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Amy Tsai 高三下 (2016/09/21)
accumulation (n.) 積聚；累積；堆積物；積累。

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