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

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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

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
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

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
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

saw, catch saw caught saw caught saw caught 当警察在街头---小偷,他们---他到警察局(见赶上 saw caught

填caught
实际是he is caught 省略了he is
having been caught 是已经被抓住 ,原句意思是:当被抓住的同时,小偷不得不承认,所以不用完成时。