the police have caught some of the robbers since the robbery happ_英语解答

the police have caught some of the robbers since the robbery happened这句话什么意思
have为什么不能填are

人气：197 ℃　时间：2019-10-17 01:45:43

解答

意思是警察在劫案发生时已抓住了几个抢劫犯.
因为有since用现在完成时,have+done
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