单项选择题

A．The second and fifth.
B．Only the sixth.
C．Only the second.
D．Both the second and sixth.
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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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