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【题目】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】考查动词。句意:截止到我锁门的时候,我意识到我把钥匙拉家里了。根据时间状语by the time I locked the door,可知 主句用过去完成时。A. had described ”描述“; B. had explained”解释“; C. had forgotten”忘记 “; D. had left”落下“。根据句意,选D。

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