When Nancy was at college, she ____ three foreign languages, but I am surprised to find that  she ____ all except a few words of each.

A．spoke; had forgotten

B．had spoken; had forgotten

C．spoke; has forgotten

D．had spoken; has forgotten

预防和治疗酸蚀症的主要方法如下，除外

A．改善劳动条件，消除和减少空气中的酸雾

B．食酸性饮食后漱口

C．保持口腔卫生，增加刷牙次数

D．缺损严重者进行充填修复

E．对症治疗