Mother wanted to be a good provider a role she since her marriage to Father.A. shoulders

问题补充：

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

答案：

A. shoulders

B. shouldered

C. is shouldering

(答案→)D. has been shouldering

解析：考查时态。本句的关键是后面的since her marriage to Father，该介词表示“自从…”要和现在完成时或者现在完成进行时连用。故D正确。