肥胖是下列哪种风湿病的易感因素

A．强直性脊柱炎

B．骨性关节炎

C．类风湿关节炎

D．反应性关节炎

E．风湿性关节炎

I think you've got to the point ______ a change is needed, otherwise you'll fail.

A. when
B. that

C. where

D. which