作业帮I don't know who invented the machine,but I think it is a/the useful invention.a还是the?
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I don't know who invented the machine,but I think it is a/the useful invention.a还是the?
I don't know who invented the machine,but I think it is a/the useful invention.a还是the?
I don't know who invented the machine,but I think it is a/the useful invention.a还是the?
a 意为“一种”,表示泛指.
a
a