one of the most useful inventions is computer .that is what is i have found.合并句子

one of the most useful inventions is computer .that is what is i have found.合并句子
one of the most useful inventions ()i have found()computer.
英语人气:606 ℃时间:2019-12-20 21:02:42
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第一个空是that
第二个空是is
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