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AccordingtoCharlesKeeling,theamountofcarbondioxide

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AccordingtoCharlesKeeling,theamountofcarbondioxide

According to Charles Keeling, the amount of carbon dioxide ________ sharply and steadily over the forty years between 1957 and 1997.

  A. increased                B. had increased     

  C. had been increased    D. was increasing

【回答】

A

知识点:动词时态与语态

题型:选择题

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