参考答案：signaled

解析：[听力原文]1-20 Washington: The Bush administration has {{U}}signaled{{/U}} for the first time that it may be willing to {{U}}allow{{/U}} a multinational force in Iraq to operate under the {{U}}sponsorship{{/U}} of the United Nations as long as {{U}}it is commanded{{/U}} by an American. The idea was described by Richard L.Armitage, the deputy secretary of state, as just "{{U}}one idea being explored{{/U}}" in discussions at the United Nations. It was first {{U}}hinted{{/U}} at publicly last week by Kofi Annan, the United Nations’ secretary general. Mr. Armitage’s remarks, made {{U}}on Tuesday{{/U}} to regional reporters and released by {{U}}the State Department{{/U}} today, represent {{U}}a potential shift{{/U}} in course for the administration, which has until now insisted that all {{U}}military, economic and political{{/U}} matters in Iraq remain under total American control. Allowing the United Nations {{U}}a leadership role{{/U}} would be intended to win the support of the Security Council for {{U}}a new mandate{{/U}} authorizing the {{U}}American-led{{/U}} occupation of the country. In his remarks, Mr. Armitage {{U}}declined{{/U}} to discuss the plans {{U}}in any detail{{/U}}, saying, "I don’t think it helps to {{U}}throw them out{{/U}} publicly right now." But he described the arrangement under consideration as "a multinational force {{U}}under U.N. leadership{{/U}}" in which "the American would be the U.N. commander." On Monday, Defense Secretary Donald H. Rumsfeld was asked whether he could {{U}}envision{{/U}} American troops fighting {{U}}under United Nations’ command{{/U}}. His answer: "I think that’s not going to happen." But he went on to rule out only "{{U}}a blue-hatted leadership{{/U}}" meaning by the United Nations, whose troops wear blue helmets over a peacekeeping force in Iraq.

[分析]： 动词。 本句是现在完成时态，注意动词的时态，应使用过去分词形式，signal意思是：发出信号、表示。速记技巧：sgnld。