My best friend Gina studies very hard．She often studies very late every night, sometimes _____2 a.m．

A．at        B．until       C．before            D．to

1、B

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My best friend Gina studies very hard．She often studies very late every night, sometimes _____2 a.m．

A．a(chǎn)t        B．until       C．before            D．to

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