49.How many times has the man attended this conference?
(A) This is his first time.
(B) He's been to two conferences.
(C) He's a conference expert.
(D) He didn't mention it in the conversation.
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統計: A(35), B(287), C(32), D(12), E(0) #3158561
統計: A(35), B(287), C(32), D(12), E(0) #3158561