单项选择题

The police were making an investigation into the accident ______ 100 people were killed.

A．in which
B．where
C．when
D．for what
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单项选择题
The doctor explained to the police officer that it was too dangerous to ______ the bullet from his backbone.
A．exert
B．exploit
C．squeeze
D．capture
单项选择题
He ______ the gun beneath a huge bag before entering the checkpoint of the airport.
A．contracted
B．collected
C．concealed
D．constituted
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