The wall of our classroom is white, but the blackboard is b-------.------填空

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The  wall  of  our  classroom  is  white, but  the  blackboard  is  b-------.------填空

The wall of our classroom is white, but the blackboard is b-------.------填空
The wall of our classroom is white, but the blackboard is b-------.
------填空

The wall of our classroom is white, but the blackboard is b-------.------填空
black