the dog, I in love with animals gradually.
A. While walking , fell
B. While walked, fell
C. While is walking, am
D. When was walked, was
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(答案→)A. While walking , fell
B. While walked, fell
C. While is walking, am
D. When was walked, was
解析：考查状语从句的省略和动词短语：句意：当遛狗的时候，我逐渐的喜欢上了动物。While walking=while I was walking the dog，当主从句的主语一致的时候，可以省略从句的主语和be动词，第二空填fall，fall in love with爱上…，是短暂动词，选A。