When I got on the bus,I__________I had left my waliet at home.A.was realizing B.

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问题 When I got on the bus,I__________I had left my waliet at home.

选项 A.was realizing
B.realized
C.have realized
D.would realize

答案B

解析从句中用一般过去时,故此处动作是在过去发生的,所以用一般过去时。故选B项。
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