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
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单项选择题
Many people have applied for the ______ position.
A．empty
B．bare
C．vacant
D．blank
单项选择题
The ______ salary of the staff is about $50.
A．usual
B．average
C．equal
D．common
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