誰 ___ このケーキを食べましたか。
The particle "が" (ga) marks the subject of a sentence. It's commonly used with interrogative words like "誰" (who), "何" (what), or "どれ" (which one) when the question is about identifying the subject performing the action.
助詞「が」は文の主語を示します。「誰」「何」などの疑問詞と使い、動作の主を尋ねる際に使われます。例:「何が美味しいですか。」
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