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を見たとき

when (someone) saw

→ を
phrase Rare #30,759
when (someone) saw Used to describe something that happened when someone saw something or someone. The subject is often understood from context, and を marks what was seen.
JA: その写真を見たとき、昔の友達を思い出した。
EN: When I saw that photo, I remembered an old friend.

彼女はそのドレスを見たときどうにも笑わずにはいられなかった。

She simply couldn’t help laughing when she saw that dress.

メアリーが彼を見たとき、驚きの表情が彼女の顔に浮かんだ。

When Mary saw him, a look of surprise appeared on her face.

彼は私を見たとき、表情を変えた。

When he saw me, his expression changed.

これを見たときの私の驚きといったら。

You should have seen how surprised I was when I saw this.

彼は警察官を見たとき、逃げ出した。

When he saw the police officer, he ran away.