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

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单项选择题
John is doing very well in school and it is quite()that his mother should be proud of him.

A．normal
B．natural
C．general
D．usual
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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