单项选择题

When I opened the door. I found a dog ______ in the snow.

A． lie
B． lying
C． lay
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单项选择题
Betty's parents have lived in this city ______ five years.
A． for
B． since
C． in
单项选择题
The old man turned on the radio ______ listened to it.
A． but
B． and
C． or
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