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英语
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Tom was doing his homework——his mother was cooking
选填when或者while,并说明理由
人气：453 ℃ 时间：2019-08-21 18:51:20
解答
while 因为when后面接一般过去时,也就是动词过去式,而while后接的是进行时,也就是be动词+动词ing形式
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