单项选择题

In a second hand bookshop, Billy came across a book which he thought was certainly a ______edition.

A．rare
B．scarce
C．seldom
D．hardly
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单项选择题
______ the new medicine is now in mass production.
A．With the solved problem
B．With this problem being solved
C．With the problem solved
D．With this problem to solve
单项选择题
Your comments ______ my work have proved to be helpful.
A．in
B．for
C．on
D．against
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