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----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
考查時態(tài)。句意：你完成你的作業(yè)了嗎？——不，我昨天整天都在照顧我的小妹妹。可知下文 描述的是過去一直在進行的動作，故用過去進行時態(tài)，故選A。
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