Over the past 30 years, the average robot price _____ by half in real terms, and even further relative to labor costs.
A. is fallen
B. has fallen
C. were fallen
D. have fallen
Giải bởi Vietjack
B
Kiến thức: Thì trong tiếng Anh, hoà hợp chủ ngữ và động từ
Giải thích:
Ta dùng thì hiện tại hoàn thành diễn tả hành động bắt đầu trong quá khứ và kéo dài đến hiện tại. Cấu trúc thì hiện tại hoàn thành: S + have/has + PP +...
Chủ ngữ trong câu là danh từ không đếm được “price” nên ta dùng trợ động từ “has”
Tạm dịch: Trong 30 năm qua, giá robot trung bình đã giảm một nửa theo giá trị thực và thậm chí còn liên quan nhiều hơn đến chi phí lao động.
Chọn B
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