The famous doctor____(operate)on three patients in the past 10 hours
问题描述：
The famous doctor____(operate)on three patients in the past 10 hours
The police searched the whole building but ___(find)nothing unusual
答
第一空填写has been operating
过去完成进行时~
在过去10个小时内这个医生不停地为三个病人做了手术~
第二孔填写found
和前面对照起来~
用过去时
警察搜索了整栋楼但是没有发现任何不寻常的东西~