还有3天上考场, 一道语法题急问

Federal authorities involved in the investigation have found the local witnesses are difficult to locate, reticent, and are suspicious of strangers.

化线部分应保持原状, 还是应改做

the local witnesses are difficult to locate, reticent, and suspicious of strangers.

Thanks for much for your help!!

    要改，是形容词并列

    加油！！祝好运

要改

此题考点平行结构再加宾语从句加THAT,还有就是ARE重复

that 要加，但and 后的are加不加就无所谓了