–I called you yesterday afternoon, but you were not at home.
--Sorry, I _________ some shopping with my mother then .
| A．is doing | B．do | C．was doing | D．will do |
–I called you yesterday afternoon, but you were not at home.
--Sorry, I _________ some shopping with my mother then .
| A．is doing | B．do | C．was doing | D．will do |
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