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、leaves
B、left
C、had left
D、was left

答案C

解析本题考查动词时态。因为“意识”是过去的动作，“遗忘”的动作要发生在“意识到”之前，所以用过去完成时。

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