动词适当的形式填空一题Around twenty people______their lives in the last flood.(train)

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动词适当的形式填空一题Around twenty people______their lives in the last flood.(train)
动词适当的形式填空一题
Around twenty people______their lives in the last flood.(train)

动词适当的形式填空一题Around twenty people______their lives in the last flood.(train)
trained

+ed

were trained

trained