单项选择题

We very much regret that we fail to complete the work( )the agreed contract time．

A．within
B．at
C．in
D．for
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单项选择题
汉译英：“植物检疫证书”( )。
A．phytosanitary certificate for re-export
B．phytosanitary certificate
C．quarantine declaration form on entry
D．veterinary certificate
单项选择题
He was ill，( )he went on working．
A．but
B．so
C．and
D．or
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