--Tom．Why do you look so tired?

--Because I often study late _________ 10 o'clock at night．

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

1、C

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--Tom．Why do you look so tired?

--Because I often study late _________ 10 o'clock at night．

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

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