填空题 The terrorists 1 to blow up the building if their demands were not met.
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【正确答案】 1、threatened    
【答案解析】解析： The terrorists threatened(威胁) to blow up the building if their demands(要求) were not met. 恐怖分子威胁要炸毁建筑物，如果他们的要求得不到满足