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Unread Feb 22nd, 2011, 03:27 pm
*englishbaby* *englishbaby* is offline
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Default p.m and a.m and o'clock

Hi everybody,

I have got 2 questions now
They are very simple but I wonder them.

1.What stands for a.m and p.m .
2. What constraction " o" in o'clock is ? on clock? Why do we use apostrophe here ?
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