—I called you at 4:00 yesterday afternoon, but no one answered.
—Sorry, I ______ with my friends at that time.
| A．swim | B．swam | C．will swim | D．was swimming |
—I called you at 4:00 yesterday afternoon, but no one answered.
—Sorry, I ______ with my friends at that time.
| A．swim | B．swam | C．will swim | D．was swimming |
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