2. 外语
  3. A big problem facing people today is that Scientists at Camegie Mellon University tried to find out

A big problem facing people today is that Scientists at Camegie Mellon University tried to find out

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问题 A big problem facing people today is that
Scientists at Camegie Mellon University tried to find out
选项 A、why office doors were often left open.
B、when it was a good time to turn off the computer.
C、what questions office workers were bothered with.
D、which behaviors could tell whether a person was busy.
答案D
解析
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