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    【题目】I didn’t eat an apple just now，but my sister_________.

    A. do B. does C. did D. is

    【答案】C

    【解析】试题分析：句意：刚才我没有吃苹果，但是我的姐姐吃了。do 做，动词原形；does是第三人称单数形式；did 是do的过去式；is 是。根据句意可知，这里的动词do代替的是上句话中的动作eat an apple，吃苹果，而且这里说的是过去的事情，故应用did，选C。

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