A and B are doing their homework. 对A and B提问 答案who is doing
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A and B are doing their homework. 对A and B提问 答案who is doing their homework. 为社么是is不是are?
![A and B are doing their homework. 对A and B提问 答案who is doing](/uploads/image/z/6825074-50-4.jpg?t=A+and+B+are+doing+their+homework.+%E5%AF%B9A+and+B%E6%8F%90%E9%97%AE+%E7%AD%94%E6%A1%88who+is+doing)
不知道谁在做作业当然更不知道有几个人了,怎么确定单复数呢,这种提问一般都是用单数了,除了who are his parents这种类似的情况了
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