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—What were you up to when she dropped in?

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—What were you up to when she dropped 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
C

由第一句可判断出第二句描述的事情发生在过去,for a while是相对于when she dropped in来说的when she dropped in,“我已经玩一会儿了”,因此该用过去完成时态.再看后一个动作,承接前面for a while,仍然在过去,had played for a while之后,因此应用过去将来时,表示过去那个时间将要发生的动作,故选C。