单项选择题

It's a pity that you ______ leave so soon. It's been so nice having you here.

A．can
B．could
C．should
D．might
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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
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
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