Betty's science lesson is at nine o'clock.对at nine o'clock(划线部分提问)

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Betty's science lesson is at nine o'clock.对at nine o'clock(划线部分提问)

Betty's science lesson is at nine o'clock.对at nine o'clock(划线部分提问)
Betty's science lesson is at nine o'clock.
对at nine o'clock(划线部分提问)

Betty's science lesson is at nine o'clock.对at nine o'clock(划线部分提问)
When is Betty's science lesson
When does Betty's science lesson begin