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这是谁干的

who did this

→ 这
phrase Rare #23,860
who did this A direct, often accusatory way to ask who is responsible for something. 干 means “do” here, and 的 nominalizes the preceding action.
CH: 桌子上的花瓶碎了，这是谁干的？
EN: The vase on the table is broken—who did this?

这是谁干的？

Who did this?

— 机械师 (2004)

我们都知道这是谁干的

We all know who did this.

— 浪潮 (2008)

爸爸这是谁干的

Dad, who did this?

— 巴克劳 (2019)

我不知道这是谁干的

I don't know who did this.

— 浪潮 (2008)

这是谁干的

Who did this?

— 阳光灿烂的日子 (1994)