问题
选择题
Your attention, please! ________ today is Professor Yu Dan from Beijing Normal University.
A．Have joined us
B．To join us
C．Joining us
D．Join us
答案
答案：C
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Your attention, please! ________ today is Professor Yu Dan from Beijing Normal University.
A．Have joined us
B．To join us
C．Joining us
D．Join us
答案：C