单项选择题

A．At school.
B．At home.
C．In his office.
D．On a farm.
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单项选择题
The detective and his assistant have begun to _______ the mysterious murder.
A．come through
B．look into
C．make over
D．see to
单项选择题
All matter is made up of atoms; _______, it is made up of nuclei with electrons whirling around them.
A．that is
B．on the contrary
C．in short
D．on the other hand
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