2. 外语
  3. ________the Internet of Things is to become a reality, its developers should pay more attention to its security.

________the Internet of Things is to become a reality, its developers should pay more attention to its security.

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问题 ________the Internet of Things is to become a reality, its developers should pay more attention to its security.
选项 A、If
B、Although
C、Until
D、Unless
答案A
解析 空格处需要一个从句引导词，前句“物联网成为现实”与后句“开发者们应该更加关注其安全性”构成条件关系。故选A。
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