—Mark，you look so tired．
—Oh，I didn’t go to bed________it was 12 o’clock last night．
| A．unless |
| B．after |
| C．until |
| D．as |
—Mark，you look so tired．
—Oh，I didn’t go to bed________it was 12 o’clock last night．
| A．unless |
| B．after |
| C．until |
| D．as |
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