did you see the boys yesterday afternoon --yes ,i saw them___the fence when i passed 1.climb2.climbing.两者的区别是什么?怎么选

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didyouseetheboysyesterdayafternoon--yes,isawthem___thefencewhenipassed1.climb2.climbing.两者的区别是什么?怎么选

did you see the boys yesterday afternoon --yes ,i saw them___the fence when i passed 1.climb2.climbing.两者的区别是什么?怎么选
did you see the boys yesterday afternoon --yes ,i saw them___the fence when i passed 1.climb
2.climbing.两者的区别是什么?怎么选

did you see the boys yesterday afternoon --yes ,i saw them___the fence when i passed 1.climb2.climbing.两者的区别是什么?怎么选
see sb.do表示看到某人做了某事,(表示整个过程,常与every day/often等连用)
see sb.doing表示看到某人正在做某事,(表示正在进行,句中有when I passed ,指特定的某个时刻,故选climbing)