哪一种改变不能引起继发性椎管狭窄（）

A.黄韧带肥厚

B.椎间盘向后膨隆

C.椎间盘后缘骨质增生

D.椎小关节增生

E.强直性脊柱炎

Many political leaders attended the conference and among those present ____ the foreign minister and his wife.

A．were

B．included

C．had

D．remained