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
One of the requirements for a fire is that the material（）to its burning temperature.

A．is heated
B．be heated
C．will be heated
D．has been heated
单项选择题
The boy was（）by a milk float and taken to hospital.

A．run off
B．run out
C．run over
D．run through
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