16. A major railroad junction in Illinois, Decatur has became an important commercial hub for the region’s farm products and livestock.
A为什么错啊?
26. With the ability produce and control fire, early humans could make heat and light and could cook foods that were difficult to eat raw.
怎么该啊~
谢谢大家
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16.became, 只是过去式,不是过去分词,改为become
become
ability to
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