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

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.