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
This message is very important. Can you make sure that Helen______it
A．got
B．gets
C．get
D．is getting
单项选择题
You should keep the milk in the ice box, ______it will go bad.
A．so
B．or
C．and
D．but
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