单项选择题

At first everything went well with the project but recently we have had a number of （）with the machinery.

A．disturbances
B．setbacks
C．outputs
D．distortions

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单项选择题
In spite of the（）it seemed that many of the invited guests would still show up.

A．deviation
B．distinction
C．controversy
D．comparison
单项选择题
High grades are supposed to （）academic ability, but John's actual performance did not confirm this.

A．certify
B．clarify
C．classify
D．notify
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