高考语法填空:这个空为什么是填what?能不能填that代替前面那件事?

The man obviously didn’t have enough money. But how could he tell hiskids the bad news? Seeing (what)was happening, my dad took a $20 note from his pocket and dropped it on theground.

翻译成中文:看看什麼发生了
而不会是看看这发生了
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