单项选择题

He was ill，( )he went on working．

A．but
B．so
C．and
D．or
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单项选择题
For ( )commodities as oil，sand and timber，rail is cheaper than road．
A．unpacked
B．bulk
C．unpackaged
D．large quantities of
单项选择题
There has been a nation-wide shortage of building materials，( )which the trade is only just recove- ring．
A．for
B．on
C．at
D．from
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