单项选择题

Many people watched the boys ______ the mountain at that time.

A．climb
B．climbing
C．to climb
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After he heard the news, he went to the hospital ______ once.
A．at
B．on
C．in
单项选择题
If I ______ free tomorrow, I will go shopping with my aunt.
A．will be
B．am
C．be
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