女，30岁。右侧肢体乏力起病伴头痛和语言笨拙6个月。入院检查眼底视盘水肿，右上下肢肌力Ⅳ级，左下肢病理征（+）。CT检查可见颅内一低密度病灶，周围无水肿，增强后不均匀强化。患者术后复查肿瘤缩小65％，疗效评价（）

A.显效

B.有效

C.微效

D.无变化

E.恶化

It was the first time that a Canadian ________ a gold medal in a Winter Olympics . [ ]

A. won  

B. has won

C. had won  

D. was winning