Fill in the gap with the correct form of the word.
Smartphone can vary from day to day due to new ________ by different companies in the world. (invent)
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Chủ đề / Chương
Bài học
Chủ đề
Fill in the gap with the correct form of the word.
Smartphone can vary from day to day due to new ________ by different companies in the world. (invent)
