单项选择题

Undergraduate students（） the rare books in the school library.

A．have access for
B．keep access in
C．keep access on
D．have access to

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单项选择题
_______ sat down _______ the phone rang.
A．No sooner had he … than
B．No sooner he had … than
C．No sooner had he … when
D．No sooner he had … when
单项选择题
It is useful to be able to predict the extent _______ which a price change will influence supply and demand.
A．from
B．with
C． to
D．for
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