— When _________ you________ your teeth, Billy?
—Just now.
| A．do; brush | B．have; brushed |
| C．did; brush | D．was: brushing |
— When _________ you________ your teeth, Billy?
—Just now.
| A．do; brush | B．have; brushed |
| C．did; brush | D．was: brushing |
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