问题
选择题
The blackboard is _______ the wall(墙). It is_______ in the wall. 
[ ]
A. on, not
B. on, /
C. in, not
答案
答案：A
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The blackboard is _______ the wall(墙). It is_______ in the wall. [ ]
A. on, not
B. on, /
C. in, not
答案：A