题目内容

----Have you finished your homework?
-----No, I ________ my younger sister all day yesterday.
A．was looking afterB．would look after
C．had looked afterD．look after
A
考查时态。句意：你完成你的作业了吗？——不，我昨天整天都在照顾我的小妹妹。可知下文 描述的是过去一直在进行的动作，故用过去进行时态，故选A。
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