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

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

【答案】C

【解析】試題分析：句意：剛才我沒(méi)有吃蘋果，但是我的姐姐吃了。do 做，動(dòng)詞原形；does是第三人稱單數(shù)形式；did 是do的過(guò)去式；is 是。根據(jù)句意可知，這里的動(dòng)詞do代替的是上句話中的動(dòng)作eat an apple，吃蘋果，而且這里說(shuō)的是過(guò)去的事情，故應(yīng)用did，選C。

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