People's lives ____ a lot thanks to the inventions of these devices.
Đáp án đúng là: C. have changed
Giải thích:
Sử dụng thì hiện tại hoàn thành 'have changed' để diễn tả sự thay đổi đã xảy ra và có ảnh hưởng đến hiện tại. 'People's lives' là chủ ngữ số nhiều.
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