(单选题)
Just as I got to the school gate, I realized I ______ my book at home.
A.have left
B.had left
C.left
参考答案：B
参考解析：
考查过去完成时。句意：当我到达校门口的时候，我才意识到我把书落在家里了。到达学校已经是过去时态，把书落在家里应该是过去的过去，使用过去完成时。故选B。
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