单项选择题

The thief tried to open the locked door but______.

A．in no way
B．in vain
C．without effect
D．at a loss
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单项选择题
The tomato juice left brown______on the front of my jacket.
A．spot
B．point
C．track
D．trace
单项选择题
My boss has always attended to the______of important business himself.
A．transaction
B．solution
C．translation
D．stimulation
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