单项选择题

The first volume was published ______.

A．ten years ago
B．five years ago
C．last year
D．twenty years ago
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单项选择题
So far, how many volumes of the book have been published
A．Five.
B．Three.
C．Four.
D．None.
单项选择题
______ you keep on practicing English, you can use it freely one day.
A．As long as
B．As well as
C．As soon as
D．As possible as
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