单项选择题

A．Fifty students.
B．Forty students.
C．Twenty-five students.
D．Fifteen students.
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单项选择题
A．The second and fifth.B．Only the sixth.C．Only the second.D．Both the second and sixth.
A．The second and fifth.
B．Only the sixth.
C．Only the second.
D．Both the second and sixth.
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