问题描述：
[单选]
The number of Tik Tok users（抖音用户） sharply since Tik Tok in 2016． It’s really popular now．A． has risen; appeared B． have been risen; appearedC． have raised; was appeared D． has been raised; was appeared
A．A
B．B
C．C
D．D
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答案解析：无
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