单项选择题


A．when
B．until
C．since
D．while
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单项选择题
A．wallB．boxC．ceilingD．pole
A．wall
B．box
C．ceiling
D．pole
单项选择题
In some parts of the world, tea ______ with milk and sugar.
A．is serving
B．is served
C．serves
D．served
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