Probable error in the 質問 context sentence

WaniKani Bugs & Errors
1

The line is 彼はある観客からの予想外の質問にたじろいだ。but since たじろぐ is a verb (and since it’s clearly translated as past tense), I think this was meant to be a た not a だ.

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2

たじろいだ is correct since the verb ends in ぐ. See Japanese Verb Plain Past た Form

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3

Ah, now I feel silly. I forgot how that works or I read it as く or something.