—Tom, you look tired this morning. What’s wrong?—I was so busy that I didn’t go to bed________
—Tom,youlooktiredthismorning.What’swrong?—IwassobusythatIdidn’tgotobed________12o’clo...
—Tom, you look tired this morning. What’s wrong?—I was so busy that I didn’t go to bed________12 o’clock last night. A．until B．when C．though D．unless
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| A |
| 本题符合not···until的结构，表示直到···才，故选答案为A |
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