She wondered if that could be true expresses doubt about possibility, which is the standard use of could. Would expresses conditionality, was and had been are not modals suitable here.
Fill in the most appropriate Modal in the given sentence from the given options:-
She wondered if that ________ be true.
Held on 22 Jun 2023 · Verified 13 Jul 2026.
would
could
was
had been
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