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6、--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

6、C

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--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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