Choose one sentence that has the same meaning as the root one:
She turned the radio on at 7.30. She was still listening to it when her mother came home at 9.00.
A. She has been listening to the radio at 7.30.
B. She had been listening to the radio since 7.30.
C. She has been listening to the radio after 7.30.
D. She has been listening to the radio by 7.30.

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