--Markyou look so tired

--OhI didn't go to bed _________it was 12 o'clock last night

Aunless           Bafter               Cuntil               Das

1、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.a(chǎn)fter               C.until               D.a(chǎn)s

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