单项选择题

She came into the room while they ______ television.

[A] have watched
B. have been watching
C. were watching
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单项选择题
The Whites have lived in the house______they came to the city.
[A] until
B. since
C. when
单项选择题
What do we know from this dialogue
A. The man bought a camera from this shop before.
B. The man doesn’t seem to buy the camera.
C. The shop is out of cameras.
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