单项选择题

We have made a try to boost participation in the program, but it failed.

A. attempt
B. effort
C. energy
D. source
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单项选择题
Our party is perfect with our great efforts
A. excellent
B. normal
C. common
D. casual
单项选择题
He failed the exam again because he was so careless.
A. useless
B. attentionless
C. foolish
D. handsome
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