I have learned a lot about Asian customs, ______ in the small village for three years in the early 1990s.

A．lived

B．to live

C．having lived

D．to have lived

某合作学习小组讨论辨析以下说法：①粗盐和酸雨都是混合物；②酒精和氯化氢都是非电解质；③冰和干冰既是纯净物又是化合物；④Na₂O和Na₂O₂都是碱性氧化物；⑤硝酸和氯气都可作氧化剂；⑥纯碱和熟石灰都是碱；⑦豆浆和雾都是胶体．

上述说法正确的是（　　）

A．①②③④

B．①②⑤⑥

C．③⑤⑥⑦

D．①③⑤⑦