用适当的连词将两个句子合成一句,使句子通顺
1.Tom come back from school.his mother was doing some washing
2.Gina always sings .Gina is doing some cleaning
人气：160 ℃ 时间：2020-09-23 19:12:14
解答
1.Tom come back from school (while) his mother was doing some washing.
2..Gina always sings (while )she is doing some cleaning.
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