单项选择题

Mary ______ be in London because I saw her in town only an hour ago.

A．won't
B．mustn't
C．may not
D．can't
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单项选择题
At 13 he was sent to a shop, ______ he learned the business.
A．where
B．which
C．when
D．that
单项选择题
You don't have to drive him home. He ______ already.
A．leaves
B．is leaving
C．has left
D．had left
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