使混悬剂中微粒的ζ电位降低的为

A．抗氧剂
B．润湿剂
C．助悬剂
D．絮凝剂
E．反絮凝剂

Premier Zhou (周 * * ) _____ for many years, but he still lives in the hearts of Chinese people.   [ ]

A. died              

B. has died

C. has been dead      

D. has been died