When I got on the bus II had left my wallet at home.A. was realizingB. realizedC. have rea

问题补充：

When I got on the bus,II had left my wallet at home.

A. was realizing

B. realized

C. have realized

D. would realize

答案：

A. was realizing

(答案→)B. realized

C. have realized

D. would realize

解析：考察时态。由When I got on the bus可知时态为一般过去时。