问题补充：
When I got on the bus，I I had left my wallet at home.(·山东)
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：考查动词的时态。我上车后意识到把钱包忘在家里了。结合语境可知，这里描述的是过去发生的一个瞬间动作，所以用一般过去时。
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