How many people _____ the conference on self-improvement?A. attended B. is attending C. do they attend D. attends

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How many people _____ the conference on self-improvement?A. attended B. is attending C. do they attend D. attends
How many people _____ the conference on self-improvement?
A. attended B. is attending C. do they attend D. attends

How many people _____ the conference on self-improvement?A. attended B. is attending C. do they attend D. attends
A.有多少人参加了有关自我修养的讨论会?