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