单项选择题

He is accustomed ______ late on weekends for he has the habit of working at night.

A．to sit up
B．to sitting up
C．at sitting up
D．for sitting up
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All that ______ is not gold.
A．glitter
B．glitters
C．glittering
D．glittered
单项选择题
You must have missed the meeting the other day, ______ you
A．mustn't
B．haven't
C．needn't
D．didn't
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