单项选择题

Too bad--I missed the early train ______ only a few minutes!

A．at
B．in
C．by
D．after
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单项选择题
My former school is now very different from ______ it was when I was there.
A．what
B．where
C．that
D．which
单项选择题
Ever since he ______ his job, Allen has been much happier than before.
A．has changed
B．had changed
C．changed
D．changes
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