男性，40岁，腰背痛3年，与气候无关，休息时症状减轻或消失，劳累时加重，弯腰活动受限，腰部过伸或轻叩时疼痛减轻。检查：腰部两侧相当于棘突两旁骶棘肌处轻度肌张力增强及压痛，下肢无异常。试述诊断及治疗。

She________the opportunity，but unfortunately she just let it go.

A．should have taken

B．must have taken

C．needn't have taken

D．can't have taken