---What were you upto when she dropped in?---I ________ for awhile and ________ some reading.A.wasplaying; was going to doB.played;didC.hadplayed; was going to doD.hadplayed; did
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C解析由第一句判断第二句描述的事情发生在过去，for a while是相对于whenshe dropped in来说的，when she dropped in，我已经玩了一会儿了，因此要用过去完成时。再看后一个动作，承接前面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，选择C。