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    - May I speak to Professor Black, please? - Sorry, but he is busy an experiment in the lab right now. A. conducting B. working C. acting D. researching 【查看更多】

     

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    －May I speak to __________ Professor Black, please?

    －Sorry, but he is busy conducting ____________ experiment in the lab right now.

    A．the; an      B．a; the   C．不填; an      D．the; the

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