Don’t leave your seat ________ all the papers have been collected by the teacher.
A．a(chǎn)fterB．when
C．sinceD．until
D

試題分析：句意：直到所有的試卷都被老師收起來才能離開你的座位。not…until…直到……才……。根據(jù)句意，故選D。
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