题文
—— Has Jack finished his homework yet?
—— I have no idea； he ＿＿＿it this morning.
| A．was doing | B．had been doing |
| C．has done | D．did |
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—— Has Jack finished his homework yet?
—— I have no idea； he ＿＿＿it this morning.
| A．was doing | B．had been doing |
| C．has done | D．did |
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