---Lucy, what were you doing at nine last night?
---I ___________ the piano. I usually practice the piano at that time.
| A．play | B．played |
| C．was playing | D．am playing |
---Lucy, what were you doing at nine last night?
---I ___________ the piano. I usually practice the piano at that time.
| A．play | B．played |
| C．was playing | D．am playing |
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