— I don’t understand why you didn’t go to the lecture yesterday afternoon.
—I’m so sorry. But I _________ my homework.
| A．had done | B．was doing | C．would do | D．am doing |
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— I don’t understand why you didn’t go to the lecture yesterday afternoon.
—I’m so sorry. But I _________ my homework.
| A．had done | B．was doing | C．would do | D．am doing |
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