单项选择题

A．Once
B．Never
C．Hardly
D．Frequently
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单项选择题
A．everyoneB．anyoneC．someoneD．no one
A．everyone
B．anyone
C．someone
D．no one
单项选择题
A．studyingB．studiedC．to studyD．having studied
A．studying
B．studied
C．to study
D．having studied
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