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英语
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they-----[do/doing]their homework 选do还是选doing
人气:462 ℃ 时间:2019-12-01 13:02:09
解答
答案:do
这个句子的主语是they,所以这里还缺谓语动词,而doing是不能单独作谓语动词的,所以用do.
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