单选题20.When I caught him______, I stopped buying things there and started dealing with another shop.
【正确答案】
A
【答案解析】catch作“当场破获,发觉,撞见(某人)做某事(尤指坏事)”讲时,后面常接“名词/代词+现在分词”,例如:I caught the boys stealing apples from my garden.我撞见那些孩子们偷我园中的苹果。You won’t catch me doing that again!我再也不会干那种事了。因此,A为正确答案。