题目内容
15.The twenty-six countriessigned ( sign ) an agreement to cut air pollution.分析 26个国家签署了减少污染的协议.
解答 答案:signed
根据句意可知,叙述的是过去的一件事情,所以用一般过去时,即signed.
点评 考生须根据句子的语境选择合适的时态.
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