单项选择题

In an old bookstore, you often（）the early editions of many valuable books.

A．come across
B．come about
C．come with
D．come on

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Speaking of talent for organization, you are one（）a thousand.

A．at
B．to
C．on
D．in
单项选择题
We don't need air conditioning,（）

A．nor can we afford it
B．and nor we can afford it
C．neither can afford it
D．and we can neither afford it
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