We walk in the moonlight, taking about we were interested in.
A. used to, all what
B. were used to, all what
C. used to, all that
D. were used to, what
网友回答
A. used to, all what
B. were used to, all what
(答案→)C. used to, all that
D. were used to, what
解析：考查固定用法和定语从句。句意“我们过去常常在月光下散步，谈论我们感兴趣的事情。”used to do sth.“过去常常做某事”；all看作是先行词，先行词是不定代词时，引导词用that，all that相当于what。故选C。