For the last 20 years, we _______ significant changes in the world of science and technology.
Đáp án B
Giải thích:
"For the last + khoảng thời gian xác định" → dấu hiệu nhận biết thì hiện tại hoàn thành
Cấu trúc: S + has/have + Vpp
Dịch: Trong 20 năm qua, chúng ta đã chứng kiến nhiều thay đổi đáng kể trong thế giới khoa học và công nghệ.
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