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语法题.In 1911 the Great Blue Norther,a massive storm in the mi

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语法题.
In 1911 the Great Blue Norther,a massive storm in the midwestern United States,(it caused) temperatures in some cites to drop more than 60 degrees in a single day.
为什么用caused 不用causing.
In 1911 (时间状语)the Great Blue Norther(句子主语),a massive storm in the midwestern United States,(主语同位语) caused (句子谓语)temperatures in some cites to drop more than 60 degrees in a single day
cause 在此句中充当谓语,句中又有In 1911 表示明确的过去时间的时间状语,所以用cause过去时.causing不能作谓语,它是非谓语形式.