单项选择题

A．by
B．in
C．for
D．with
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单项选择题
A．suchB．oneC．anyD．some
A．such
B．one
C．any
D．some
单项选择题
Why do students in summer schools learn quickly
A．Because they all work very hard.
B．Because their teachers are all native speakers of English.
C．Because they learn not only in but also out of class.
D．Because they are all advanced students.
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