36.—— What were you up to when your parents came in? —— I＿＿＿＿＿for a while

题目

36.—— What were you up to when your parents came in? —— I＿＿＿＿＿for a while
36.—— 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
有的说B,有的说C,个人认为是B,因为这里没有过去的过去,就是2个并列的动作,对过去所做事情的描述

答案

C 答案,
问那时候你在干什么某个时刻的事情,所以必须有进行时,
是过去式之前的事情,所以用过去完成时
我已经玩了（过去完成时）好一会了,正要去读书呢
所以用had played,然后过去进行时 was going to do