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  3. ______ a professor of physics at Massachusetts Institute of Technology, Edward Charles Pickering established the first physics l

______ a professor of physics at Massachusetts Institute of Technology, Edward Charles Pickering established the first physics l

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问题 ______ a professor of physics at Massachusetts Institute of Technology, Edward Charles Pickering established the first physics laboratory in the United States.
选项 A、While
B、being
C、Although
D、He was
答案A
解析 句型结构题。while后可接一名词或介词短语构成省略结构句型，A为正确答案。句意：当他还是马萨诸塞科技学院的一名物理教授时，爱得华就建立了全美国第一家物理实验室。
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