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
My former school is now very different from______ it was when I was there.
A．that
B．where
C．what
D．which
单项选择题
Tom______ a photograph of me while I was not looking.
A．is taking
B．had taken
C．will take
D．took
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