2. 外语
  3. It must have been the lifeguard ______ (在危险关头给出了信号).

It must have been the lifeguard ______ (在危险关头给出了信号).

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问题 It must have been the lifeguard ______ (在危险关头给出了信号).
选项
答案who gave the signal in time of danger
解析 本题考查强调句的用法。强调句的固定句型是It is...that/who，本题强调主语the lifeguard，因而用who引导。整个句子发生在过去，故用过去时。“给出信号”可译为give the signal；“危险关头”可译为in time of danger，注意time前不用加定冠词the。类似的表达还有：in time of stress在困难时刻，in time of War在战争时期。
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大学英语六级

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