单项选择题

My colleagues and I were greatly puzzled by our repeated failures in the experiment.

A．distressed
B．discontented
C．annoyed
D．perplexed
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单项选择题
The merit of a sales tax is that it decreases government reliance on income taxes.
A．outcome
B．supply
C．virtue
D．balance
单项选择题
John boasted that he could finish the job all by himself in no time.
A．very rapidly
B．on time
C．in time
D．at any moment
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