单项选择题

Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
What did FBI use as an investigative tool

A．National Security Bills.
B．National Security Letters.
C．U.S. Code.
D．Human Rights Bills.

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Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. Now, listen to the news. What did FBI use as an investigative tool 您的浏览器不支持 audio 元素。