单项选择题

A．at noon
B．in the morning
C．at night
D．in spring
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单项选择题
A．had gone upB．has gone upC．goes upD．is going up
A．had gone up
B．has gone up
C．goes up
D．is going up
单项选择题
A．studyingB．studiedC．to studyD．having studied
A．studying
B．studied
C．to study
D．having studied
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