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
The situation was ______ for a breakthrough that night.
A．favourable
B．favourite
C．preferable
D．applicable
单项选择题
To reach a correct conclusion, they had debated the subject ______.
A．naturally
B．elegantly
C．at last
D．at length
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