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．until
C．as
D．after
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单项选择题
I didn't expect you to arrive so soon. How long did the journey ______.
A．go
B．cover
C．make
D．take
单项选择题
Susan got sunburned because she ______ on the beach all afternoon.
A．lay
B．is lying
C．has lain
D．had been lying
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