.Mother wanted to be a good provider a role shesince her marriage to Father.A. shouldersB

问题补充：

.Mother wanted to be a good provider, a role shesince her marriage to Father.

A. shoulders

B. shouldered

C. is shouldering

D. has been shouldering

答案：

A. shoulders

B. shouldered

C. is shouldering

(答案→)D. has been shouldering

解析：考查时态。句意：母亲向成为一个很好地养家者，一个自从他嫁给父亲以来就肩负的角色。结合语境可知下文描述的是从过去某时开始一直持续到现在的动作，并且还将持续下去。故用完成进行时态。故选D。