Your attention, please! today is Professor Yu Dan from Beijing Normal University.A. Have

发布时间：2020-08-16 13:11:44


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

网友回答

A. Have joined us
B. To join us
(答案→)C. Joining us
D. Join us
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