单项选择题

The committee is ______ session; no one can enter the hall.

A．on
B．at
C．in
D．for
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单项选择题
He then ______ overalls (工作服) and spent the next eight hours as a dustman.
A．changed into
B．exchanged for
C．altered
D．turned into
单项选择题
Many people have applied for the ______ position.
A．empty
B．bare
C．vacant
D．blank
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