— Its said a pianist will perform at Poly Theater on Friday evening. Is it Lang Lang? — Y

— It's said a pianist will perform at Poly Theater on Friday evening. Is it Lang Lang?
— Yes, it him. He for a week.
A. must be; has arrived here
B. Can’t; has been here
C. must be; has been here
D. maybe; has arrived here

A. must be; has arrived hereB. Can’t; has been here (答案→)C. must be; has been hereD. maybe; has arrived here解析：must,can(could),may(maight) 可以表示猜测，must 表示肯定猜测，用于肯定句，肯定……，一定……；can’t,表示否定猜测，肯定不……，另外can(could),may(maight)，表示可能性猜测，可能……。现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作（用行为动词表示）或状态（be动词表示）常与for（+时间段）,since（+时间点或过去时的句子）连用. 现在完成时中，非延续性动词不能与for和since引导的表示一段时间的状语连用，通常是用相应的延续性动词来代替。arrive，对应的延续性状态是be in ,如果是地点副词，省略介词。根据句意他来这里有一周了，可知，肯定是朗朗。故选C.

谢谢了