----When did you go to bed last night, Tom?
----At 10 pm. But my mother___________,
| A．is working | B．works |
| C．was working | D．worked |
----When did you go to bed last night, Tom?
----At 10 pm. But my mother___________,
| A．is working | B．works |
| C．was working | D．worked |
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