单项选择题

I'm used to driving in Hong Kong now, but it ______ hard at the beginning.

A．is
B．was
C．had been
D．has been
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单项选择题
The firemen arrived half an hour ______ the alarm was first raised, when it was too late to save much of the building.
A．since
B．after
C．as
D．until
单项选择题
--Where is my blue shirt --It's in the washing machine. You have to wear ______ different shirt.
A．a
B．other
C．any
D．the
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