を読んだ

read

→ を
phrase Rare #28,692
read を marks the thing being read, and 読んだ is the past form of 読む (to read). Depending on context, it can also mean “have read.”
JA: 昨日、面白い小説を読んだ。
EN: I read an interesting novel yesterday.

私は多くの現代作家を読んだ

I have read many modern authors.

お前の思考を読んだまで

I merely read your thoughts.

— 不思議惑星キン・ザ・ザ (1986)

実は台本を読んだので君は――台本を読んだ

Actually... I read the script, so you— I read the script.

— デッド・ドント・ダイ (2019)

彼は夕食後しばしば推理小説を読んだものだった

He used to often read mystery novels after dinner.

今までに何冊の本を読んだと思いますか

How many books do you think you’ve read so far?

その男はすぐに彼の論文を読んだ

The man read his paper right away.