when _____{catch}on the spot in the shopping center,the thief had to confess what he had done.怎么

when _____{catch}on the spot in the shopping center,the thief had to confess what he had done.怎么

题目
when _____{catch}on the spot in the shopping center,the thief had to confess what he had done.怎么
什么时候用 caught ,什么时候用 having been caught thanks
答案
填having bee caught
caught单纯的过去时
having been caught,完成时,have变成having,动名词表状态
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