29. Nowadays some popular YouTubers have millions of ___, who pay nothing to watch their video blogs.
(A) qualifications
(B) revolutionaries
(C) subscribers
(D) whereabouts
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統計: A(12), B(27), C(422), D(7), E(0) #2240990
統計: A(12), B(27), C(422), D(7), E(0) #2240990