单项选择题

After he heard the news, he went to the hospital ______ once.

A．at
B．on
C．in
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单项选择题
If I ______ free tomorrow, I will go shopping with my aunt.
A．will be
B．am
C．be
单项选择题
-- Where is Tom Do you know-- I think he ______ to the library.
A．has gone
B．has been
C．went
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