单项选择题

I stayed up ______ 1:30 a.m. for that report.

[A] until
[B] at
[C] before
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—What are you doing —I'm ______ the piano.
[A] exercising
[B] practising
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Since I began to work here three years ago, this factory ______ in size.
[A] had doubled
[B] has doubled
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