单项选择题

There were then more than 200 children __________ music in the school.

A．to study
B．studying
C．study
D．studied
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单项选择题
This is the second time that John __________ in his final exam.
A．has failed
B．fails
C．failed
D．failing
单项选择题
I, who __________ a Patty member, will always try my best to help you.
A．be
B．is
C．are
D．am
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