I've become good friends with several of the students in my school________I met in the English speech contest last year.

A．who

B．where

C．when

D．which

有助于诊断急性脊髓炎的临床表现中，下述哪一项最不重要（）

A.病理反射阳性

B.肢体瘫痪

C.括约肌障碍

D.急性感染的临床表现

E.感觉障碍