动词短语
中文翻译：被要求
同义词：
['be summoned', 'be addressed', 'be called upon']
例句：
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1.The teacher was called on to speak atthe assembly.
老师被叫到大会上发言。
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2.She was called on to volunteer for thecommunity service project.
她被要求为社区服务项目做志愿者。
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3. The president was called onto deliver a speech at the conference.
总统被要求在会议上发表演讲。