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They usually have supper___ six,but tonight they have supper

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They usually have supper___ six,but tonight they have supper___ seven.
填介词
They usually have supper___ six,but tonight they have supper
They usually have supper at six,but tonight they have supper in seven.
前一个用at 是因为是一般现在时,表示习惯性的动作;而第二个表示偶然性的事件用in