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 he?
He must be playing computer games at home,isn't he,为何用isn't he?
英语人气：175 ℃时间：2020-04-02 18:50:45
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