On reaching the top floor I suddenly realized that I _______my book on the service desk.

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问题 On reaching the top floor I suddenly realized that I _______my book on the service desk.

选项 A、had forgotten
B、left
C、had left
D、was left

答案C

解析 根据本句句意:一到顶层我才突然意识到我把自己的书放在服务台上了。故本题答案为C。
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