单选题
Scientists at Camegie Mellon University tried to find out ______.
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
【正确答案】
D
【答案解析】
答案在第三段最后一句，第四段第一句也给出了部分答案。故答案为D。
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