【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】考查動詞。句意：截止到我鎖門的時候，我意識到我把鑰匙拉家里了。根據(jù)時間狀語by the time I locked the door，可知 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“。根據(jù)句意，選D。

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