Translation of "Clue" in Chinese

I have no clue.

我一无所知。

I don't have a clue.

我真的不知道。

- I have no idea.
- I don't have a clue.
- I have no clue.

- 我不知道。
- 我沒意見。
- 我一无所知。

The authorities have no clue, but everyone else knows.

- 當局者迷。
- 当局者迷，旁观者清。
- 当局者迷。
- 旁观者清，当局者迷。

- I don't know.
- I haven't got a clue.
- I do not know.
- Dunno.

我不知道。

- Who she is I have no idea.
- I have no idea who she is.
- I don't have a clue who she is.

我不知道她是谁。

- I don't know at all why he quit his job suddenly.
- I haven't got a clue as to why he quit so suddenly.

我完全不明白他為甚麼會突然辭職。