—Amy, I called you yesterday evening，but nobody answered the phone.
—Oh, I ________ a walk with my mother at that time.
| A．take | B．took |
| C．am taking | D．was taking |
—Amy, I called you yesterday evening，but nobody answered the phone.
—Oh, I ________ a walk with my mother at that time.
| A．take | B．took |
| C．am taking | D．was taking |
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