Mother wanted to be a good provider, a role she________since her marriage to Father. [ ]

A. shoulders    

B. shouldered

C. is shouldering  

D. has been shouldering

与躯体深部平滑肌瘤不同，腹膜后/腹腔平滑肌瘤常可表达（）。

A.α-SMA

B.desmin

C.ER和PR

D.calponin

E.h-caldesmon