单项选择题


A．since
B．before
C．unless
D．when
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单项选择题
You ______ television. Why not do something more active
A．always watch
B．are always watching
C．have always watched
D．have always been watching
单项选择题
His mother works at the market ______ sells vegetable and fruits.
A．where
B．in which
C．at which
D．which
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