【題目】By the time I locked the door, I realized I ______my keys at home.

A. had described B. had explained

C. had forgotten D. had left

【答案】D

【解析】句意為截止到我鎖門的時候，我意識到我把鑰匙拉家里了。By the time 主句用過去完成時。A. had described 描述 B. had explained解釋 C. had forgotten忘記 D. had left落下

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