.Mother wanted to be a good provider, a role she________since her marriage to Father.
A．shouldersB．shoulderedC．is shoulderingD．has been shouldering
D
考查時態(tài)。句意：母親向成為一個很好地養(yǎng)家者，一個自從他嫁給父親以來就肩負(fù)的角色。結(jié)合語境可知下文描述的是從過去某時開始一直持續(xù)到現(xiàn)在的動作，并且還將持續(xù)下去。故用完成進(jìn)行時態(tài)。故選D。
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