有关热限成因的主要假说及机制中哪项不正确（）。

A.应急性粗调假说

B.内生性解热系统假说

C.温敏神经元突触闸门机制假说

D.体温正调节受限和负调节加强假说

E.体温调节中枢麻痹

— Have you known Dr Jackson for a long time?

— Yes, since she _____ the Chinese Society. [ ]

A. has joined

B. joins

C. had joined

D. joined