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.

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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.

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.
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.

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.
第一个空是that
第二个空是is