别因为看到must而用了mustn't(禁止）
因为这句的主干是“He is playing ."
而must只是表示肯定的判断,不影响主句意思.
所以用isn't he.
例：
You must know the truth,don't you?
He must be playing computer games at home,isn't he,为何用isn't
3个回答
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