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By the time I got to school, I realized that I ______ my pen at home.

A. have forgotten
B. have left
C. had forgotten
D. had left
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科目:初中英语 来源:期末题 题型:单选题

By the time I got to school, I realized that I ______ my pen at home.
[     ]
A. have forgotten
B. have left
C. had forgotten
D. had left

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