单项选择题

Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ______of the quality of their products.

A．expense
B．expansion
C．exposure
D．expectation
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单项选择题
One witness ______that he'd seen the suspect run out of the bank after it had been robbed.
A．convicted
B．retorted
C．conformed
D．testified
单项选择题
Knowing that the cruel criminal has done a lot of unlawful things, I feel sure that I have no ______but to report him to the local police.
A．time
B．chance
C．authority
D．alternative
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