She had just finished her homework __________ her mother asked her to practice __________ the piano yesterday.
| A．when; playing | B．while; to play |
| C．after; play | D．since; played |
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She had just finished her homework __________ her mother asked her to practice __________ the piano yesterday.
| A．when; playing | B．while; to play |
| C．after; play | D．since; played |
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