---I called you at 4:00 yesterday afternoon, but nobody answered.
---Sorry, I ______ with my friends at that time.
| A．had swum | B．swam |
| C．would swim | D．was swimming |
---I called you at 4:00 yesterday afternoon, but nobody answered.
---Sorry, I ______ with my friends at that time.
| A．had swum | B．swam |
| C．would swim | D．was swimming |
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