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には驚いた

was surprised by

→ に
phrase Uncommon #10,054
was surprised by Follows the thing that caused surprise; には can add emphasis or contrast.
JA: 彼の記憶力には驚いた。
EN: I was surprised by his memory.

その発見には驚いた。

I was surprised by that discovery.

あなたの手紙には驚いたわ。

Your letter surprised me.

シャベールには驚いた

I was surprised by Shabert.

— コーラス (2004)

この地図には驚いたよ

I was amazed by this map.

— グエムル -漢江の怪物- (2006)

お前の話には驚いたよ。

I was surprised by what you said.

彼の無知には驚いた。

I was surprised by his ignorance.