【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(shí)間狀語(yǔ)over the forty years between 1957 and 1997是過(guò)去的時(shí)間狀語(yǔ)，所以用一般過(guò)去時(shí)。故選A。

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