问题
选择题
By the time I got to school, I realized I_________ my backpack at home.[ ]
A. left
B. had left
C. was leaving
D. had forgotten
答案
答案：B
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By the time I got to school, I realized I_________ my backpack at home.[ ]
A. left
B. had left
C. was leaving
D. had forgotten
答案：B