问题
选择题
That man over there must be our English teacher, ?[ ]
A. needn't he
B. mustn't he
C. doesn't he
D. isn't he
答案
答案：D
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That man over there must be our English teacher, ?[ ]
A. needn't he
B. mustn't he
C. doesn't he
D. isn't he
答案：D
，正电荷
，正电荷
，负电荷
，负电荷