We _____ walk in the park after supper, talking about all _____ we were interested in.A.used to, whatB.were used to, whatC.used to, thatD.were used to, which
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C解析考查固定短语以及定语从句。句意; 我们过去饭后经常在公园里散步，谈论关于我们所感兴趣的一切。第一空固定短语用used to do sth, 第二空是定语从句用关系代词that。