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.
单项选择题
A．Sell pens.B．Repair pens.C．Develop pens.D．Making pens.
A．Sell pens.
B．Repair pens.
C．Develop pens.
D．Making pens.
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