【題目】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

【答案】A

【解析】

試題分析：句中的時間狀語over the forty years between 1957 and 1997是過去的時間狀語，所以用一般過去時。故選A。

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