第4题: [单项选择]—What were you up to when your parents came in —I ______ for a while and ______ some reading. A. was playing; was going to do B. played; did C. had played; was going to do D. had played; did 参考答案:C 答案解析:play在came in之前已完成,而do some reading的动作则即将开始。