—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由第一句可判斷出第二句描述的事情發(fā)生在過去，for a while是相對于when she dropped in來說的when she dropped in，“我已經(jīng)玩一會兒了”，因此該用過去完成時態(tài)．再看后一個動作，承接前面for a while，仍然在過去，had played for a while之后，因此應(yīng)用過去將來時，表示過去那個時間將要發(fā)生的動作，故選C。

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