Susan had to walk five miles back to the office after realizing she \_\_\_\_ her wallet there.
Ahad left正確答案
Bhas left
Chave left
Dhas been leaving
答案與詳解
過去完成式(had left)正確表達「在過去某個時間點(意識到或走回去)之前就已經發生」的動作,完全符合「過去的過去」之時間順序邏輯。
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