No one knows what (happen) before it really happens 用所给词的适当形式填空

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No one knows what (happen) before it really happens 用所给词的适当形式填空
No one knows what (happen) before it really happens 用所给词的适当形式填空

No one knows what (happen) before it really happens 用所给词的适当形式填空
答案:will happen
必须用一般将来时态,因为后面的happens为一般现在时,之后就应该用一般现在时态.